mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
23f40a0788
Official AVI specification says that stream header in case of video contains BITMAPINFO, which is equal to BITMAPINFOHEADER and optional palette. Currently lavf AVI demuxer thinks otherwise which produces garbage on codecs that have both palette and extradata (luckily, there are not so many such codecs). An example of such file is: http://samples.multimedia.cx/V-codecs/KMVC/baseball1.avi (IIRC, MSS1 or MSS2 also had such situation but they are still not supported by lavc). As a side note, passing palette in extradata as it's been done previously is not quite correct since proper _extra_ data is surplus bytes in BITMAPINFOHEADER, not including palette. Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
1384 lines
46 KiB
C
1384 lines
46 KiB
C
/*
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* AVI demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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//#define DEBUG
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//#define DEBUG_SEEK
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#include <strings.h>
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#include "libavutil/intreadwrite.h"
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#include "libavutil/bswap.h"
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#include "avformat.h"
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#include "avi.h"
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#include "dv.h"
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#include "riff.h"
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#undef NDEBUG
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#include <assert.h>
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typedef struct AVIStream {
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int64_t frame_offset; /* current frame (video) or byte (audio) counter
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(used to compute the pts) */
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int remaining;
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int packet_size;
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int scale;
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int rate;
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int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
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int64_t cum_len; /* temporary storage (used during seek) */
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int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
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int prefix_count;
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uint32_t pal[256];
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int has_pal;
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int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
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AVFormatContext *sub_ctx;
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AVPacket sub_pkt;
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uint8_t *sub_buffer;
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} AVIStream;
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typedef struct {
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int64_t riff_end;
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int64_t movi_end;
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int64_t fsize;
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int64_t movi_list;
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int64_t last_pkt_pos;
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int index_loaded;
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int is_odml;
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int non_interleaved;
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int stream_index;
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DVDemuxContext* dv_demux;
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int odml_depth;
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#define MAX_ODML_DEPTH 1000
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} AVIContext;
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static const char avi_headers[][8] = {
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
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{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
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{ 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
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{ 0 }
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};
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static int avi_load_index(AVFormatContext *s);
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static int guess_ni_flag(AVFormatContext *s);
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#define print_tag(str, tag, size) \
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av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
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str, tag & 0xff, \
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(tag >> 8) & 0xff, \
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(tag >> 16) & 0xff, \
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(tag >> 24) & 0xff, \
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size)
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static inline int get_duration(AVIStream *ast, int len){
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if(ast->sample_size){
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return len;
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}else if (ast->dshow_block_align){
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return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
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}else
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return 1;
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}
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static int get_riff(AVFormatContext *s, AVIOContext *pb)
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{
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AVIContext *avi = s->priv_data;
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char header[8];
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int i;
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/* check RIFF header */
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avio_read(pb, header, 4);
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avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
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avi->riff_end += avio_tell(pb); /* RIFF chunk end */
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avio_read(pb, header+4, 4);
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for(i=0; avi_headers[i][0]; i++)
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if(!memcmp(header, avi_headers[i], 8))
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break;
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if(!avi_headers[i][0])
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return -1;
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if(header[7] == 0x19)
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av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
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return 0;
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}
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
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AVIContext *avi = s->priv_data;
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AVIOContext *pb = s->pb;
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int longs_pre_entry= avio_rl16(pb);
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int index_sub_type = avio_r8(pb);
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int index_type = avio_r8(pb);
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int entries_in_use = avio_rl32(pb);
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int chunk_id = avio_rl32(pb);
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int64_t base = avio_rl64(pb);
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int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
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AVStream *st;
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AVIStream *ast;
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int i;
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int64_t last_pos= -1;
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int64_t filesize= avio_size(s->pb);
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
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longs_pre_entry,index_type, entries_in_use, chunk_id, base);
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#endif
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if(stream_id >= s->nb_streams || stream_id < 0)
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return -1;
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st= s->streams[stream_id];
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ast = st->priv_data;
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if(index_sub_type)
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return -1;
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avio_rl32(pb);
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if(index_type && longs_pre_entry != 2)
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return -1;
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if(index_type>1)
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return -1;
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if(filesize > 0 && base >= filesize){
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
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if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
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base &= 0xFFFFFFFF;
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else
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return -1;
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}
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for(i=0; i<entries_in_use; i++){
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if(index_type){
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int64_t pos= avio_rl32(pb) + base - 8;
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int len = avio_rl32(pb);
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int key= len >= 0;
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len &= 0x7FFFFFFF;
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
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#endif
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if(pb->eof_reached)
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return -1;
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if(last_pos == pos || pos == base - 8)
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avi->non_interleaved= 1;
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if(last_pos != pos && (len || !ast->sample_size))
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av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
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ast->cum_len += get_duration(ast, len);
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last_pos= pos;
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}else{
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int64_t offset, pos;
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int duration;
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offset = avio_rl64(pb);
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avio_rl32(pb); /* size */
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duration = avio_rl32(pb);
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if(pb->eof_reached)
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return -1;
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pos = avio_tell(pb);
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if(avi->odml_depth > MAX_ODML_DEPTH){
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av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
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return -1;
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}
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avio_seek(pb, offset+8, SEEK_SET);
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avi->odml_depth++;
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read_braindead_odml_indx(s, frame_num);
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avi->odml_depth--;
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frame_num += duration;
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avio_seek(pb, pos, SEEK_SET);
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}
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}
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avi->index_loaded=1;
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return 0;
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}
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static void clean_index(AVFormatContext *s){
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int i;
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int64_t j;
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for(i=0; i<s->nb_streams; i++){
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AVStream *st = s->streams[i];
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AVIStream *ast = st->priv_data;
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int n= st->nb_index_entries;
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int max= ast->sample_size;
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int64_t pos, size, ts;
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if(n != 1 || ast->sample_size==0)
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continue;
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while(max < 1024) max+=max;
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pos= st->index_entries[0].pos;
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size= st->index_entries[0].size;
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ts= st->index_entries[0].timestamp;
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for(j=0; j<size; j+=max){
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av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
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}
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}
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}
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static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
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{
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AVIOContext *pb = s->pb;
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char key[5] = {0}, *value;
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size += (size & 1);
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if (size == UINT_MAX)
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return -1;
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value = av_malloc(size+1);
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if (!value)
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return -1;
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avio_read(pb, value, size);
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value[size]=0;
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AV_WL32(key, tag);
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return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
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AV_METADATA_DONT_STRDUP_VAL);
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}
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static void avi_read_info(AVFormatContext *s, uint64_t end)
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{
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while (avio_tell(s->pb) < end) {
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uint32_t tag = avio_rl32(s->pb);
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uint32_t size = avio_rl32(s->pb);
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avi_read_tag(s, NULL, tag, size);
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}
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}
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static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
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{
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char month[4], time[9], buffer[64];
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int i, day, year;
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/* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
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if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
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month, &day, time, &year) == 4) {
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for (i=0; i<12; i++)
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if (!strcasecmp(month, months[i])) {
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snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
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year, i+1, day, time);
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av_metadata_set2(metadata, "creation_time", buffer, 0);
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}
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} else if (date[4] == '/' && date[7] == '/') {
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date[4] = date[7] = '-';
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av_metadata_set2(metadata, "creation_time", date, 0);
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}
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}
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static void avi_read_nikon(AVFormatContext *s, uint64_t end)
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{
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while (avio_tell(s->pb) < end) {
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uint32_t tag = avio_rl32(s->pb);
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uint32_t size = avio_rl32(s->pb);
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switch (tag) {
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case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
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uint64_t tag_end = avio_tell(s->pb) + size;
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while (avio_tell(s->pb) < tag_end) {
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uint16_t tag = avio_rl16(s->pb);
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uint16_t size = avio_rl16(s->pb);
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const char *name = NULL;
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char buffer[64] = {0};
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size -= avio_read(s->pb, buffer,
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FFMIN(size, sizeof(buffer)-1));
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switch (tag) {
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case 0x03: name = "maker"; break;
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case 0x04: name = "model"; break;
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case 0x13: name = "creation_time";
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if (buffer[4] == ':' && buffer[7] == ':')
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buffer[4] = buffer[7] = '-';
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break;
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}
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if (name)
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av_metadata_set2(&s->metadata, name, buffer, 0);
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avio_skip(s->pb, size);
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}
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break;
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}
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default:
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avio_skip(s->pb, size);
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break;
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}
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}
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}
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static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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AVIContext *avi = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned int tag, tag1, handler;
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int codec_type, stream_index, frame_period, bit_rate;
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unsigned int size;
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int i;
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AVStream *st;
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AVIStream *ast = NULL;
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int avih_width=0, avih_height=0;
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int amv_file_format=0;
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uint64_t list_end = 0;
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int ret;
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avi->stream_index= -1;
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if (get_riff(s, pb) < 0)
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return -1;
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avi->fsize = avio_size(pb);
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if(avi->fsize<=0)
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avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
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/* first list tag */
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stream_index = -1;
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codec_type = -1;
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frame_period = 0;
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for(;;) {
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if (pb->eof_reached)
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goto fail;
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tag = avio_rl32(pb);
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size = avio_rl32(pb);
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print_tag("tag", tag, size);
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switch(tag) {
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case MKTAG('L', 'I', 'S', 'T'):
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list_end = avio_tell(pb) + size;
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/* Ignored, except at start of video packets. */
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tag1 = avio_rl32(pb);
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print_tag("list", tag1, 0);
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if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
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avi->movi_list = avio_tell(pb) - 4;
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if(size) avi->movi_end = avi->movi_list + size + (size & 1);
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else avi->movi_end = avio_size(pb);
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av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
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goto end_of_header;
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}
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else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
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avi_read_info(s, list_end);
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else if (tag1 == MKTAG('n', 'c', 'd', 't'))
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avi_read_nikon(s, list_end);
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break;
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case MKTAG('I', 'D', 'I', 'T'): {
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unsigned char date[64] = {0};
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size += (size & 1);
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size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
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avio_skip(pb, size);
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avi_metadata_creation_time(&s->metadata, date);
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break;
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}
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case MKTAG('d', 'm', 'l', 'h'):
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avi->is_odml = 1;
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avio_skip(pb, size + (size & 1));
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break;
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case MKTAG('a', 'm', 'v', 'h'):
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amv_file_format=1;
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case MKTAG('a', 'v', 'i', 'h'):
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/* AVI header */
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/* using frame_period is bad idea */
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frame_period = avio_rl32(pb);
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bit_rate = avio_rl32(pb) * 8;
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avio_rl32(pb);
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avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
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avio_skip(pb, 2 * 4);
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avio_rl32(pb);
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avio_rl32(pb);
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avih_width=avio_rl32(pb);
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avih_height=avio_rl32(pb);
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|
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avio_skip(pb, size - 10 * 4);
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break;
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case MKTAG('s', 't', 'r', 'h'):
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/* stream header */
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|
|
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tag1 = avio_rl32(pb);
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handler = avio_rl32(pb); /* codec tag */
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|
|
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if(tag1 == MKTAG('p', 'a', 'd', 's')){
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avio_skip(pb, size - 8);
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break;
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}else{
|
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stream_index++;
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st = av_new_stream(s, stream_index);
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|
if (!st)
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goto fail;
|
|
|
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ast = av_mallocz(sizeof(AVIStream));
|
|
if (!ast)
|
|
goto fail;
|
|
st->priv_data = ast;
|
|
}
|
|
if(amv_file_format)
|
|
tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
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|
|
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print_tag("strh", tag1, -1);
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|
|
|
if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
|
|
int64_t dv_dur;
|
|
|
|
/*
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|
* After some consideration -- I don't think we
|
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* have to support anything but DV in type1 AVIs.
|
|
*/
|
|
if (s->nb_streams != 1)
|
|
goto fail;
|
|
|
|
if (handler != MKTAG('d', 'v', 's', 'd') &&
|
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handler != MKTAG('d', 'v', 'h', 'd') &&
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handler != MKTAG('d', 'v', 's', 'l'))
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goto fail;
|
|
|
|
ast = s->streams[0]->priv_data;
|
|
av_freep(&s->streams[0]->codec->extradata);
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av_freep(&s->streams[0]->codec);
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|
av_freep(&s->streams[0]);
|
|
s->nb_streams = 0;
|
|
if (CONFIG_DV_DEMUXER) {
|
|
avi->dv_demux = dv_init_demux(s);
|
|
if (!avi->dv_demux)
|
|
goto fail;
|
|
}
|
|
s->streams[0]->priv_data = ast;
|
|
avio_skip(pb, 3 * 4);
|
|
ast->scale = avio_rl32(pb);
|
|
ast->rate = avio_rl32(pb);
|
|
avio_skip(pb, 4); /* start time */
|
|
|
|
dv_dur = avio_rl32(pb);
|
|
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
|
|
dv_dur *= AV_TIME_BASE;
|
|
s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
|
|
}
|
|
/*
|
|
* else, leave duration alone; timing estimation in utils.c
|
|
* will make a guess based on bitrate.
|
|
*/
|
|
|
|
stream_index = s->nb_streams - 1;
|
|
avio_skip(pb, size - 9*4);
|
|
break;
|
|
}
|
|
|
|
assert(stream_index < s->nb_streams);
|
|
st->codec->stream_codec_tag= handler;
|
|
|
|
avio_rl32(pb); /* flags */
|
|
avio_rl16(pb); /* priority */
|
|
avio_rl16(pb); /* language */
|
|
avio_rl32(pb); /* initial frame */
|
|
ast->scale = avio_rl32(pb);
|
|
ast->rate = avio_rl32(pb);
|
|
if(!(ast->scale && ast->rate)){
|
|
av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
|
|
if(frame_period){
|
|
ast->rate = 1000000;
|
|
ast->scale = frame_period;
|
|
}else{
|
|
ast->rate = 25;
|
|
ast->scale = 1;
|
|
}
|
|
}
|
|
av_set_pts_info(st, 64, ast->scale, ast->rate);
|
|
|
|
ast->cum_len=avio_rl32(pb); /* start */
|
|
st->nb_frames = avio_rl32(pb);
|
|
|
|
st->start_time = 0;
|
|
avio_rl32(pb); /* buffer size */
|
|
avio_rl32(pb); /* quality */
|
|
ast->sample_size = avio_rl32(pb); /* sample ssize */
|
|
ast->cum_len *= FFMAX(1, ast->sample_size);
|
|
// av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
|
|
|
|
switch(tag1) {
|
|
case MKTAG('v', 'i', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_VIDEO;
|
|
|
|
ast->sample_size = 0;
|
|
break;
|
|
case MKTAG('a', 'u', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_AUDIO;
|
|
break;
|
|
case MKTAG('t', 'x', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
break;
|
|
case MKTAG('d', 'a', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_DATA;
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
|
|
goto fail;
|
|
}
|
|
if(ast->sample_size == 0)
|
|
st->duration = st->nb_frames;
|
|
ast->frame_offset= ast->cum_len;
|
|
avio_skip(pb, size - 12 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'f'):
|
|
/* stream header */
|
|
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
|
|
avio_skip(pb, size);
|
|
} else {
|
|
uint64_t cur_pos = avio_tell(pb);
|
|
if (cur_pos < list_end)
|
|
size = FFMIN(size, list_end - cur_pos);
|
|
st = s->streams[stream_index];
|
|
switch(codec_type) {
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
if(amv_file_format){
|
|
st->codec->width=avih_width;
|
|
st->codec->height=avih_height;
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_AMV;
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
tag1 = ff_get_bmp_header(pb, st);
|
|
|
|
if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = CODEC_ID_XSUB;
|
|
break;
|
|
}
|
|
|
|
if(size > 10*4 && size<(1<<30)){
|
|
st->codec->extradata_size= size - 10*4;
|
|
st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!st->codec->extradata) {
|
|
st->codec->extradata_size= 0;
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
avio_read(pb, st->codec->extradata, st->codec->extradata_size);
|
|
}
|
|
|
|
if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
|
|
avio_r8(pb);
|
|
|
|
/* Extract palette from extradata if bpp <= 8. */
|
|
/* This code assumes that extradata contains only palette. */
|
|
/* This is true for all paletted codecs implemented in Libav. */
|
|
if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
|
|
int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
|
|
const uint8_t *pal_src;
|
|
|
|
pal_size = FFMIN(pal_size, st->codec->extradata_size);
|
|
pal_src = st->codec->extradata + st->codec->extradata_size - pal_size;
|
|
#if HAVE_BIGENDIAN
|
|
for (i = 0; i < pal_size/4; i++)
|
|
ast->pal[i] = av_bswap32(((uint32_t*)pal_src)[i]);
|
|
#else
|
|
memcpy(ast->pal, pal_src, pal_size);
|
|
#endif
|
|
ast->has_pal = 1;
|
|
}
|
|
|
|
print_tag("video", tag1, 0);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
|
|
st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
|
|
// Support "Resolution 1:1" for Avid AVI Codec
|
|
if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
|
|
st->codec->extradata_size >= 31 &&
|
|
!memcmp(&st->codec->extradata[28], "1:1", 3))
|
|
st->codec->codec_id = CODEC_ID_RAWVIDEO;
|
|
|
|
if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
|
|
st->codec->extradata_size+= 9;
|
|
st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if(st->codec->extradata)
|
|
memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
|
|
}
|
|
st->codec->height= FFABS(st->codec->height);
|
|
|
|
// avio_skip(pb, size - 5 * 4);
|
|
break;
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
ret = ff_get_wav_header(pb, st->codec, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
ast->dshow_block_align= st->codec->block_align;
|
|
if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
|
|
av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
|
|
ast->sample_size= st->codec->block_align;
|
|
}
|
|
if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
|
|
avio_skip(pb, 1);
|
|
/* Force parsing as several audio frames can be in
|
|
* one packet and timestamps refer to packet start. */
|
|
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
|
|
/* ADTS header is in extradata, AAC without header must be
|
|
* stored as exact frames. Parser not needed and it will
|
|
* fail. */
|
|
if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
|
|
st->need_parsing = AVSTREAM_PARSE_NONE;
|
|
/* AVI files with Xan DPCM audio (wrongly) declare PCM
|
|
* audio in the header but have Axan as stream_code_tag. */
|
|
if (st->codec->stream_codec_tag == AV_RL32("Axan")){
|
|
st->codec->codec_id = CODEC_ID_XAN_DPCM;
|
|
st->codec->codec_tag = 0;
|
|
}
|
|
if (amv_file_format){
|
|
st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
|
|
ast->dshow_block_align = 0;
|
|
}
|
|
break;
|
|
case AVMEDIA_TYPE_SUBTITLE:
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_id = CODEC_ID_PROBE;
|
|
break;
|
|
default:
|
|
st->codec->codec_type = AVMEDIA_TYPE_DATA;
|
|
st->codec->codec_id= CODEC_ID_NONE;
|
|
st->codec->codec_tag= 0;
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case MKTAG('i', 'n', 'd', 'x'):
|
|
i= avio_tell(pb);
|
|
if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX)){
|
|
read_braindead_odml_indx(s, 0);
|
|
}
|
|
avio_seek(pb, i+size, SEEK_SET);
|
|
break;
|
|
case MKTAG('v', 'p', 'r', 'p'):
|
|
if(stream_index < (unsigned)s->nb_streams && size > 9*4){
|
|
AVRational active, active_aspect;
|
|
|
|
st = s->streams[stream_index];
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
|
|
active_aspect.den= avio_rl16(pb);
|
|
active_aspect.num= avio_rl16(pb);
|
|
active.num = avio_rl32(pb);
|
|
active.den = avio_rl32(pb);
|
|
avio_rl32(pb); //nbFieldsPerFrame
|
|
|
|
if(active_aspect.num && active_aspect.den && active.num && active.den){
|
|
st->sample_aspect_ratio= av_div_q(active_aspect, active);
|
|
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
|
|
}
|
|
size -= 9*4;
|
|
}
|
|
avio_skip(pb, size);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'n'):
|
|
if(s->nb_streams){
|
|
avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
|
|
break;
|
|
}
|
|
default:
|
|
if(size > 1000000){
|
|
av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
|
|
"I will ignore it and try to continue anyway.\n");
|
|
avi->movi_list = avio_tell(pb) - 4;
|
|
avi->movi_end = avio_size(pb);
|
|
goto end_of_header;
|
|
}
|
|
/* skip tag */
|
|
size += (size & 1);
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
end_of_header:
|
|
/* check stream number */
|
|
if (stream_index != s->nb_streams - 1) {
|
|
fail:
|
|
return -1;
|
|
}
|
|
|
|
if(!avi->index_loaded && pb->seekable)
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
avi->non_interleaved |= guess_ni_flag(s);
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
if(st->nb_index_entries)
|
|
break;
|
|
}
|
|
if(i==s->nb_streams && avi->non_interleaved) {
|
|
av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
|
|
avi->non_interleaved=0;
|
|
}
|
|
|
|
if(avi->non_interleaved) {
|
|
av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
|
|
clean_index(s);
|
|
}
|
|
|
|
ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
|
|
if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
|
|
uint8_t desc[256];
|
|
int score = AVPROBE_SCORE_MAX / 2, ret;
|
|
AVIStream *ast = st->priv_data;
|
|
AVInputFormat *sub_demuxer;
|
|
AVRational time_base;
|
|
AVIOContext *pb = avio_alloc_context( pkt->data + 7,
|
|
pkt->size - 7,
|
|
0, NULL, NULL, NULL, NULL);
|
|
AVProbeData pd;
|
|
unsigned int desc_len = avio_rl32(pb);
|
|
|
|
if (desc_len > pb->buf_end - pb->buf_ptr)
|
|
goto error;
|
|
|
|
ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
|
|
avio_skip(pb, desc_len - ret);
|
|
if (*desc)
|
|
av_metadata_set2(&st->metadata, "title", desc, 0);
|
|
|
|
avio_rl16(pb); /* flags? */
|
|
avio_rl32(pb); /* data size */
|
|
|
|
pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
|
|
if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
|
|
goto error;
|
|
|
|
if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
|
|
av_read_packet(ast->sub_ctx, &ast->sub_pkt);
|
|
*st->codec = *ast->sub_ctx->streams[0]->codec;
|
|
ast->sub_ctx->streams[0]->codec->extradata = NULL;
|
|
time_base = ast->sub_ctx->streams[0]->time_base;
|
|
av_set_pts_info(st, 64, time_base.num, time_base.den);
|
|
}
|
|
ast->sub_buffer = pkt->data;
|
|
memset(pkt, 0, sizeof(*pkt));
|
|
return 1;
|
|
error:
|
|
av_freep(&pb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
|
|
AVPacket *pkt)
|
|
{
|
|
AVIStream *ast, *next_ast = next_st->priv_data;
|
|
int64_t ts, next_ts, ts_min = INT64_MAX;
|
|
AVStream *st, *sub_st = NULL;
|
|
int i;
|
|
|
|
next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
|
|
AV_TIME_BASE_Q);
|
|
|
|
for (i=0; i<s->nb_streams; i++) {
|
|
st = s->streams[i];
|
|
ast = st->priv_data;
|
|
if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
|
|
ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
|
|
if (ts <= next_ts && ts < ts_min) {
|
|
ts_min = ts;
|
|
sub_st = st;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sub_st) {
|
|
ast = sub_st->priv_data;
|
|
*pkt = ast->sub_pkt;
|
|
pkt->stream_index = sub_st->index;
|
|
if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
|
|
ast->sub_pkt.data = NULL;
|
|
}
|
|
return sub_st;
|
|
}
|
|
|
|
static int get_stream_idx(int *d){
|
|
if( d[0] >= '0' && d[0] <= '9'
|
|
&& d[1] >= '0' && d[1] <= '9'){
|
|
return (d[0] - '0') * 10 + (d[1] - '0');
|
|
}else{
|
|
return 100; //invalid stream ID
|
|
}
|
|
}
|
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int n, d[8];
|
|
unsigned int size;
|
|
int64_t i, sync;
|
|
void* dstr;
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
int size = dv_get_packet(avi->dv_demux, pkt);
|
|
if (size >= 0)
|
|
return size;
|
|
}
|
|
|
|
if(avi->non_interleaved){
|
|
int best_stream_index = 0;
|
|
AVStream *best_st= NULL;
|
|
AVIStream *best_ast;
|
|
int64_t best_ts= INT64_MAX;
|
|
int i;
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
int64_t ts= ast->frame_offset;
|
|
int64_t last_ts;
|
|
|
|
if(!st->nb_index_entries)
|
|
continue;
|
|
|
|
last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
|
|
if(!ast->remaining && ts > last_ts)
|
|
continue;
|
|
|
|
ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
|
|
if(ts < best_ts){
|
|
best_ts= ts;
|
|
best_st= st;
|
|
best_stream_index= i;
|
|
}
|
|
}
|
|
if(!best_st)
|
|
return -1;
|
|
|
|
best_ast = best_st->priv_data;
|
|
best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
|
|
if(best_ast->remaining)
|
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
|
|
else{
|
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
|
|
if(i>=0)
|
|
best_ast->frame_offset= best_st->index_entries[i].timestamp;
|
|
}
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "%d\n", i);
|
|
if(i>=0){
|
|
int64_t pos= best_st->index_entries[i].pos;
|
|
pos += best_ast->packet_size - best_ast->remaining;
|
|
avio_seek(s->pb, pos + 8, SEEK_SET);
|
|
// av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
|
|
|
|
assert(best_ast->remaining <= best_ast->packet_size);
|
|
|
|
avi->stream_index= best_stream_index;
|
|
if(!best_ast->remaining)
|
|
best_ast->packet_size=
|
|
best_ast->remaining= best_st->index_entries[i].size;
|
|
}
|
|
}
|
|
|
|
resync:
|
|
if(avi->stream_index >= 0){
|
|
AVStream *st= s->streams[ avi->stream_index ];
|
|
AVIStream *ast= st->priv_data;
|
|
int size, err;
|
|
|
|
if(get_subtitle_pkt(s, st, pkt))
|
|
return 0;
|
|
|
|
if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
|
|
size= INT_MAX;
|
|
else if(ast->sample_size < 32)
|
|
// arbitrary multiplier to avoid tiny packets for raw PCM data
|
|
size= 1024*ast->sample_size;
|
|
else
|
|
size= ast->sample_size;
|
|
|
|
if(size > ast->remaining)
|
|
size= ast->remaining;
|
|
avi->last_pkt_pos= avio_tell(pb);
|
|
err= av_get_packet(pb, pkt, size);
|
|
if(err<0)
|
|
return err;
|
|
|
|
if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
|
|
uint8_t *pal;
|
|
pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
|
|
if(!pal){
|
|
av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n");
|
|
}else{
|
|
memcpy(pal, ast->pal, AVPALETTE_SIZE);
|
|
ast->has_pal = 0;
|
|
}
|
|
}
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
dstr = pkt->destruct;
|
|
size = dv_produce_packet(avi->dv_demux, pkt,
|
|
pkt->data, pkt->size);
|
|
pkt->destruct = dstr;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
if (size < 0)
|
|
av_free_packet(pkt);
|
|
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
|
|
&& !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
|
|
ast->frame_offset++;
|
|
avi->stream_index = -1;
|
|
ast->remaining = 0;
|
|
goto resync;
|
|
} else {
|
|
/* XXX: How to handle B-frames in AVI? */
|
|
pkt->dts = ast->frame_offset;
|
|
// pkt->dts += ast->start;
|
|
if(ast->sample_size)
|
|
pkt->dts /= ast->sample_size;
|
|
//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
|
|
pkt->stream_index = avi->stream_index;
|
|
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
AVIndexEntry *e;
|
|
int index;
|
|
assert(st->index_entries);
|
|
|
|
index= av_index_search_timestamp(st, ast->frame_offset, 0);
|
|
e= &st->index_entries[index];
|
|
|
|
if(index >= 0 && e->timestamp == ast->frame_offset){
|
|
if (e->flags & AVINDEX_KEYFRAME)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
} else {
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
ast->frame_offset += get_duration(ast, pkt->size);
|
|
}
|
|
ast->remaining -= size;
|
|
if(!ast->remaining){
|
|
avi->stream_index= -1;
|
|
ast->packet_size= 0;
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
memset(d, -1, sizeof(int)*8);
|
|
for(i=sync=avio_tell(pb); !pb->eof_reached; i++) {
|
|
int j;
|
|
|
|
for(j=0; j<7; j++)
|
|
d[j]= d[j+1];
|
|
d[7]= avio_r8(pb);
|
|
|
|
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
|
|
|
|
n= get_stream_idx(d+2);
|
|
//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
|
|
if(i + (uint64_t)size > avi->fsize || d[0]<0)
|
|
continue;
|
|
|
|
//parse ix##
|
|
if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
|
|
//parse JUNK
|
|
||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
|
|
||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
|
|
avio_skip(pb, size);
|
|
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
|
|
goto resync;
|
|
}
|
|
|
|
//parse stray LIST
|
|
if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
|
|
avio_skip(pb, 4);
|
|
goto resync;
|
|
}
|
|
|
|
n= get_stream_idx(d);
|
|
|
|
if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
|
|
continue;
|
|
|
|
//detect ##ix chunk and skip
|
|
if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
|
|
avio_skip(pb, size);
|
|
goto resync;
|
|
}
|
|
|
|
//parse ##dc/##wb
|
|
if(n < s->nb_streams){
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
st = s->streams[n];
|
|
ast = st->priv_data;
|
|
|
|
if(s->nb_streams>=2){
|
|
AVStream *st1 = s->streams[1];
|
|
AVIStream *ast1= st1->priv_data;
|
|
//workaround for broken small-file-bug402.avi
|
|
if( d[2] == 'w' && d[3] == 'b'
|
|
&& n==0
|
|
&& st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
|
|
&& st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
|
|
&& ast->prefix == 'd'*256+'c'
|
|
&& (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
|
|
){
|
|
n=1;
|
|
st = st1;
|
|
ast = ast1;
|
|
av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
|
|
}
|
|
}
|
|
|
|
|
|
if( (st->discard >= AVDISCARD_DEFAULT && size==0)
|
|
/*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
|
|
|| st->discard >= AVDISCARD_ALL){
|
|
ast->frame_offset += get_duration(ast, size);
|
|
avio_skip(pb, size);
|
|
goto resync;
|
|
}
|
|
|
|
if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
|
|
int k = avio_r8(pb);
|
|
int last = (k + avio_r8(pb) - 1) & 0xFF;
|
|
|
|
avio_rl16(pb); //flags
|
|
|
|
for (; k <= last; k++)
|
|
ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
|
|
ast->has_pal= 1;
|
|
goto resync;
|
|
} else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
|
|
d[2]*256+d[3] == ast->prefix /*||
|
|
(d[2] == 'd' && d[3] == 'c') ||
|
|
(d[2] == 'w' && d[3] == 'b')*/) {
|
|
|
|
//av_log(s, AV_LOG_DEBUG, "OK\n");
|
|
if(d[2]*256+d[3] == ast->prefix)
|
|
ast->prefix_count++;
|
|
else{
|
|
ast->prefix= d[2]*256+d[3];
|
|
ast->prefix_count= 0;
|
|
}
|
|
|
|
avi->stream_index= n;
|
|
ast->packet_size= size + 8;
|
|
ast->remaining= size;
|
|
|
|
if(size || !ast->sample_size){
|
|
uint64_t pos= avio_tell(pb) - 8;
|
|
if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
|
|
av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
goto resync;
|
|
}
|
|
}
|
|
}
|
|
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
/* XXX: We make the implicit supposition that the positions are sorted
|
|
for each stream. */
|
|
static int avi_read_idx1(AVFormatContext *s, int size)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int nb_index_entries, i;
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
unsigned int index, tag, flags, pos, len;
|
|
unsigned last_pos= -1;
|
|
|
|
nb_index_entries = size / 16;
|
|
if (nb_index_entries <= 0)
|
|
return -1;
|
|
|
|
/* Read the entries and sort them in each stream component. */
|
|
for(i = 0; i < nb_index_entries; i++) {
|
|
tag = avio_rl32(pb);
|
|
flags = avio_rl32(pb);
|
|
pos = avio_rl32(pb);
|
|
len = avio_rl32(pb);
|
|
#if defined(DEBUG_SEEK)
|
|
av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
|
|
i, tag, flags, pos, len);
|
|
#endif
|
|
if(i==0 && pos > avi->movi_list)
|
|
avi->movi_list= 0; //FIXME better check
|
|
pos += avi->movi_list;
|
|
|
|
index = ((tag & 0xff) - '0') * 10;
|
|
index += ((tag >> 8) & 0xff) - '0';
|
|
if (index >= s->nb_streams)
|
|
continue;
|
|
st = s->streams[index];
|
|
ast = st->priv_data;
|
|
|
|
#if defined(DEBUG_SEEK)
|
|
av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
|
|
#endif
|
|
if(pb->eof_reached)
|
|
return -1;
|
|
|
|
if(last_pos == pos)
|
|
avi->non_interleaved= 1;
|
|
else if(len || !ast->sample_size)
|
|
av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
|
|
ast->cum_len += get_duration(ast, len);
|
|
last_pos= pos;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int guess_ni_flag(AVFormatContext *s){
|
|
int i;
|
|
int64_t last_start=0;
|
|
int64_t first_end= INT64_MAX;
|
|
int64_t oldpos= avio_tell(s->pb);
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
int n= st->nb_index_entries;
|
|
unsigned int size;
|
|
|
|
if(n <= 0)
|
|
continue;
|
|
|
|
if(n >= 2){
|
|
int64_t pos= st->index_entries[0].pos;
|
|
avio_seek(s->pb, pos + 4, SEEK_SET);
|
|
size= avio_rl32(s->pb);
|
|
if(pos + size > st->index_entries[1].pos)
|
|
last_start= INT64_MAX;
|
|
}
|
|
|
|
if(st->index_entries[0].pos > last_start)
|
|
last_start= st->index_entries[0].pos;
|
|
if(st->index_entries[n-1].pos < first_end)
|
|
first_end= st->index_entries[n-1].pos;
|
|
}
|
|
avio_seek(s->pb, oldpos, SEEK_SET);
|
|
return last_start > first_end;
|
|
}
|
|
|
|
static int avi_load_index(AVFormatContext *s)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
uint32_t tag, size;
|
|
int64_t pos= avio_tell(pb);
|
|
int ret = -1;
|
|
|
|
if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
|
|
goto the_end; // maybe truncated file
|
|
#ifdef DEBUG_SEEK
|
|
printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
|
|
#endif
|
|
for(;;) {
|
|
if (pb->eof_reached)
|
|
break;
|
|
tag = avio_rl32(pb);
|
|
size = avio_rl32(pb);
|
|
#ifdef DEBUG_SEEK
|
|
printf("tag=%c%c%c%c size=0x%x\n",
|
|
tag & 0xff,
|
|
(tag >> 8) & 0xff,
|
|
(tag >> 16) & 0xff,
|
|
(tag >> 24) & 0xff,
|
|
size);
|
|
#endif
|
|
switch(tag) {
|
|
case MKTAG('i', 'd', 'x', '1'):
|
|
if (avi_read_idx1(s, size) < 0)
|
|
goto skip;
|
|
ret = 0;
|
|
goto the_end;
|
|
break;
|
|
default:
|
|
skip:
|
|
size += (size & 1);
|
|
if (avio_skip(pb, size) < 0)
|
|
goto the_end; // something is wrong here
|
|
break;
|
|
}
|
|
}
|
|
the_end:
|
|
avio_seek(pb, pos, SEEK_SET);
|
|
return ret;
|
|
}
|
|
|
|
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
|
|
{
|
|
AVIStream *ast2 = st2->priv_data;
|
|
int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
|
|
av_free_packet(&ast2->sub_pkt);
|
|
if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
|
|
avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
|
|
av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
|
|
}
|
|
|
|
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVStream *st;
|
|
int i, index;
|
|
int64_t pos;
|
|
AVIStream *ast;
|
|
|
|
if (!avi->index_loaded) {
|
|
/* we only load the index on demand */
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
}
|
|
assert(stream_index>= 0);
|
|
|
|
st = s->streams[stream_index];
|
|
ast= st->priv_data;
|
|
index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
|
|
if(index<0)
|
|
return -1;
|
|
|
|
/* find the position */
|
|
pos = st->index_entries[index].pos;
|
|
timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
/* One and only one real stream for DV in AVI, and it has video */
|
|
/* offsets. Calling with other stream indexes should have failed */
|
|
/* the av_index_search_timestamp call above. */
|
|
assert(stream_index == 0);
|
|
|
|
/* Feed the DV video stream version of the timestamp to the */
|
|
/* DV demux so it can synthesize correct timestamps. */
|
|
dv_offset_reset(avi->dv_demux, timestamp);
|
|
|
|
avio_seek(s->pb, pos, SEEK_SET);
|
|
avi->stream_index= -1;
|
|
return 0;
|
|
}
|
|
|
|
for(i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st2 = s->streams[i];
|
|
AVIStream *ast2 = st2->priv_data;
|
|
|
|
ast2->packet_size=
|
|
ast2->remaining= 0;
|
|
|
|
if (ast2->sub_ctx) {
|
|
seek_subtitle(st, st2, timestamp);
|
|
continue;
|
|
}
|
|
|
|
if (st2->nb_index_entries <= 0)
|
|
continue;
|
|
|
|
// assert(st2->codec->block_align);
|
|
assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
|
|
index = av_index_search_timestamp(
|
|
st2,
|
|
av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
|
|
flags | AVSEEK_FLAG_BACKWARD);
|
|
if(index<0)
|
|
index=0;
|
|
|
|
if(!avi->non_interleaved){
|
|
while(index>0 && st2->index_entries[index].pos > pos)
|
|
index--;
|
|
while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
|
|
index++;
|
|
}
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
|
|
/* extract the current frame number */
|
|
ast2->frame_offset = st2->index_entries[index].timestamp;
|
|
}
|
|
|
|
/* do the seek */
|
|
avio_seek(s->pb, pos, SEEK_SET);
|
|
avi->stream_index= -1;
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_close(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
AVIContext *avi = s->priv_data;
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
if (ast) {
|
|
if (ast->sub_ctx) {
|
|
av_freep(&ast->sub_ctx->pb);
|
|
av_close_input_stream(ast->sub_ctx);
|
|
}
|
|
av_free(ast->sub_buffer);
|
|
av_free_packet(&ast->sub_pkt);
|
|
}
|
|
}
|
|
|
|
av_free(avi->dv_demux);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int avi_probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
|
|
/* check file header */
|
|
for(i=0; avi_headers[i][0]; i++)
|
|
if(!memcmp(p->buf , avi_headers[i] , 4) &&
|
|
!memcmp(p->buf+8, avi_headers[i]+4, 4))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_avi_demuxer = {
|
|
"avi",
|
|
NULL_IF_CONFIG_SMALL("AVI format"),
|
|
sizeof(AVIContext),
|
|
avi_probe,
|
|
avi_read_header,
|
|
avi_read_packet,
|
|
avi_read_close,
|
|
avi_read_seek,
|
|
};
|