mirror of
https://github.com/FFmpeg/FFmpeg.git
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250 lines
8.0 KiB
C
250 lines
8.0 KiB
C
/*
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* CDXL demuxer
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* Copyright (c) 2011-2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "internal.h"
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#define CDXL_HEADER_SIZE 32
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typedef struct CDXLDemuxContext {
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AVClass *class;
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int sample_rate;
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char *framerate;
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AVRational fps;
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int read_chunk;
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uint8_t header[CDXL_HEADER_SIZE];
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int video_stream_index;
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int audio_stream_index;
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int64_t filesize;
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} CDXLDemuxContext;
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static int cdxl_read_probe(AVProbeData *p)
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{
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int score = AVPROBE_SCORE_EXTENSION + 10;
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if (p->buf_size < CDXL_HEADER_SIZE)
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return 0;
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/* reserved bytes should always be set to 0 */
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if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10]))
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return 0;
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/* check type */
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if (p->buf[0] != 1)
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return 0;
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/* check palette size */
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if (AV_RB16(&p->buf[20]) > 512)
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return 0;
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/* check number of planes */
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if (p->buf[18] || !p->buf[19])
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return 0;
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/* check widh and height */
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if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16]))
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return 0;
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/* chunk size */
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if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE)
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return 0;
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/* previous chunk size */
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if (AV_RN32(&p->buf[6]))
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score /= 2;
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/* current frame number, usually starts from 1 */
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if (AV_RB16(&p->buf[12]) != 1)
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score /= 2;
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return score;
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}
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static int cdxl_read_header(AVFormatContext *s)
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{
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CDXLDemuxContext *cdxl = s->priv_data;
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int ret;
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if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) {
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av_log(s, AV_LOG_ERROR,
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"Could not parse framerate: %s.\n", cdxl->framerate);
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return ret;
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}
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cdxl->read_chunk = 0;
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cdxl->video_stream_index = -1;
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cdxl->audio_stream_index = -1;
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cdxl->filesize = avio_size(s->pb);
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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return 0;
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}
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static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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CDXLDemuxContext *cdxl = s->priv_data;
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AVIOContext *pb = s->pb;
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uint32_t current_size, video_size, image_size;
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uint16_t audio_size, palette_size, width, height;
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int64_t pos;
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int format, frames, ret;
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if (avio_feof(pb))
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return AVERROR_EOF;
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pos = avio_tell(pb);
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if (!cdxl->read_chunk &&
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avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
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return AVERROR_EOF;
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if (cdxl->header[0] != 1) {
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av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n");
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return AVERROR_INVALIDDATA;
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}
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format = cdxl->header[1] & 0xE0;
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current_size = AV_RB32(&cdxl->header[2]);
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width = AV_RB16(&cdxl->header[14]);
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height = AV_RB16(&cdxl->header[16]);
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palette_size = AV_RB16(&cdxl->header[20]);
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audio_size = AV_RB16(&cdxl->header[22]);
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if (FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
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return AVERROR_INVALIDDATA;
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if (format == 0x20)
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image_size = width * height * cdxl->header[19] / 8;
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else
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image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
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video_size = palette_size + image_size;
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if (palette_size > 512)
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return AVERROR_INVALIDDATA;
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if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
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return AVERROR_INVALIDDATA;
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if (cdxl->read_chunk && audio_size) {
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if (cdxl->audio_stream_index == -1) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_tag = 0;
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st->codec->codec_id = AV_CODEC_ID_PCM_S8;
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if (cdxl->header[1] & 0x10) {
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st->codec->channels = 2;
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st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
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} else {
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st->codec->channels = 1;
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st->codec->channel_layout = AV_CH_LAYOUT_MONO;
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}
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st->codec->sample_rate = cdxl->sample_rate;
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st->start_time = 0;
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cdxl->audio_stream_index = st->index;
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avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
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}
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ret = av_get_packet(pb, pkt, audio_size);
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if (ret < 0)
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return ret;
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pkt->stream_index = cdxl->audio_stream_index;
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pkt->pos = pos;
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pkt->duration = audio_size;
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cdxl->read_chunk = 0;
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} else {
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if (cdxl->video_stream_index == -1) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_tag = 0;
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st->codec->codec_id = AV_CODEC_ID_CDXL;
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st->codec->width = width;
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st->codec->height = height;
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if (audio_size + video_size && cdxl->filesize > 0) {
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frames = cdxl->filesize / (audio_size + video_size);
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if(cdxl->framerate)
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st->duration = frames;
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else
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st->duration = frames * (int64_t)audio_size;
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}
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st->start_time = 0;
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cdxl->video_stream_index = st->index;
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if (cdxl->framerate)
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avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num);
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else
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avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
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}
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if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0)
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return AVERROR(ENOMEM);
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memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
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ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
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if (ret < 0) {
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av_packet_unref(pkt);
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return ret;
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}
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av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret);
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pkt->stream_index = cdxl->video_stream_index;
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->pos = pos;
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pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220;
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cdxl->read_chunk = audio_size;
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}
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if (!cdxl->read_chunk)
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avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
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return ret;
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}
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#define OFFSET(x) offsetof(CDXLDemuxContext, x)
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static const AVOption cdxl_options[] = {
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{ "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
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{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
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{ NULL },
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};
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static const AVClass cdxl_demuxer_class = {
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.class_name = "CDXL demuxer",
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.item_name = av_default_item_name,
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.option = cdxl_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_cdxl_demuxer = {
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.name = "cdxl",
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.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
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.priv_data_size = sizeof(CDXLDemuxContext),
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.read_probe = cdxl_read_probe,
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.read_header = cdxl_read_header,
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.read_packet = cdxl_read_packet,
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.extensions = "cdxl,xl",
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.flags = AVFMT_GENERIC_INDEX,
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.priv_class = &cdxl_demuxer_class,
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};
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