mirror of
https://github.com/FFmpeg/FFmpeg.git
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326 lines
9.7 KiB
C
326 lines
9.7 KiB
C
/*
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* Image format
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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* Copyright (c) 2004 Michael Niedermayer
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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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#include "libavutil/avstring.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/parseutils.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct {
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const AVClass *class; /**< Class for private options. */
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int img_first;
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int img_last;
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int img_number;
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int img_count;
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int is_pipe;
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char path[1024];
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char *pixel_format; /**< Set by a private option. */
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char *video_size; /**< Set by a private option. */
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char *framerate; /**< Set by a private option. */
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int loop;
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int start_number;
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} VideoDemuxData;
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static const int sizes[][2] = {
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{ 640, 480 },
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{ 720, 480 },
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{ 720, 576 },
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{ 352, 288 },
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{ 352, 240 },
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{ 160, 128 },
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{ 512, 384 },
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{ 640, 352 },
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{ 640, 240 },
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};
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static int infer_size(int *width_ptr, int *height_ptr, int size)
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{
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int i;
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for(i=0;i<FF_ARRAY_ELEMS(sizes);i++) {
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if ((sizes[i][0] * sizes[i][1]) == size) {
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*width_ptr = sizes[i][0];
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*height_ptr = sizes[i][1];
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return 0;
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}
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}
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return -1;
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}
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/* return -1 if no image found */
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static int find_image_range(int *pfirst_index, int *plast_index,
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const char *path, int max_start)
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{
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char buf[1024];
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int range, last_index, range1, first_index;
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/* find the first image */
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for (first_index = 0; first_index < max_start; first_index++) {
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if (av_get_frame_filename(buf, sizeof(buf), path, first_index) < 0){
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*pfirst_index =
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*plast_index = 1;
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if (avio_check(buf, AVIO_FLAG_READ) > 0)
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return 0;
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return -1;
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}
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if (avio_check(buf, AVIO_FLAG_READ) > 0)
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break;
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}
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if (first_index == 5)
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goto fail;
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/* find the last image */
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last_index = first_index;
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for(;;) {
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range = 0;
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for(;;) {
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if (!range)
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range1 = 1;
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else
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range1 = 2 * range;
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if (av_get_frame_filename(buf, sizeof(buf), path,
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last_index + range1) < 0)
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goto fail;
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if (avio_check(buf, AVIO_FLAG_READ) <= 0)
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break;
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range = range1;
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/* just in case... */
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if (range >= (1 << 30))
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goto fail;
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}
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/* we are sure than image last_index + range exists */
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if (!range)
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break;
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last_index += range;
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}
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*pfirst_index = first_index;
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*plast_index = last_index;
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return 0;
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fail:
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return -1;
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}
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static int read_probe(AVProbeData *p)
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{
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if (p->filename && ff_guess_image2_codec(p->filename)) {
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if (av_filename_number_test(p->filename))
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return AVPROBE_SCORE_MAX;
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else
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return AVPROBE_SCORE_MAX/2;
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}
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return 0;
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}
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static int read_header(AVFormatContext *s1)
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{
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VideoDemuxData *s = s1->priv_data;
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int first_index, last_index, ret = 0;
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int width = 0, height = 0;
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AVStream *st;
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enum PixelFormat pix_fmt = PIX_FMT_NONE;
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AVRational framerate;
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s1->ctx_flags |= AVFMTCTX_NOHEADER;
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st = avformat_new_stream(s1, NULL);
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if (!st) {
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return AVERROR(ENOMEM);
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}
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if (s->pixel_format && (pix_fmt = av_get_pix_fmt(s->pixel_format)) == PIX_FMT_NONE) {
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av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n", s->pixel_format);
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return AVERROR(EINVAL);
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}
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if (s->video_size && (ret = av_parse_video_size(&width, &height, s->video_size)) < 0) {
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av_log(s, AV_LOG_ERROR, "Could not parse video size: %s.\n", s->video_size);
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return ret;
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}
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if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
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av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s->framerate);
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return ret;
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}
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av_strlcpy(s->path, s1->filename, sizeof(s->path));
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s->img_number = 0;
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s->img_count = 0;
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/* find format */
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if (s1->iformat->flags & AVFMT_NOFILE)
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s->is_pipe = 0;
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else{
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s->is_pipe = 1;
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st->need_parsing = AVSTREAM_PARSE_FULL;
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}
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avpriv_set_pts_info(st, 60, framerate.den, framerate.num);
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if (width && height) {
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st->codec->width = width;
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st->codec->height = height;
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}
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if (!s->is_pipe) {
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if (find_image_range(&first_index, &last_index, s->path,
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FFMAX(s->start_number, 5)) < 0)
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return AVERROR(ENOENT);
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s->img_first = first_index;
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s->img_last = last_index;
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s->img_number = first_index;
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/* compute duration */
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st->start_time = 0;
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st->duration = last_index - first_index + 1;
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}
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if(s1->video_codec_id){
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = s1->video_codec_id;
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}else if(s1->audio_codec_id){
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = s1->audio_codec_id;
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}else{
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = ff_guess_image2_codec(s->path);
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}
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if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO && pix_fmt != PIX_FMT_NONE)
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st->codec->pix_fmt = pix_fmt;
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return 0;
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}
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static int read_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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VideoDemuxData *s = s1->priv_data;
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char filename[1024];
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int i;
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int size[3]={0}, ret[3]={0};
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AVIOContext *f[3];
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AVCodecContext *codec= s1->streams[0]->codec;
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if (!s->is_pipe) {
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/* loop over input */
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if (s->loop && s->img_number > s->img_last) {
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s->img_number = s->img_first;
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}
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if (s->img_number > s->img_last)
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return AVERROR_EOF;
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if (av_get_frame_filename(filename, sizeof(filename),
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s->path, s->img_number)<0 && s->img_number > 1)
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return AVERROR(EIO);
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for(i=0; i<3; i++){
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if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
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&s1->interrupt_callback, NULL) < 0) {
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if(i==1)
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break;
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av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",filename);
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return AVERROR(EIO);
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}
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size[i]= avio_size(f[i]);
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if(codec->codec_id != AV_CODEC_ID_RAWVIDEO)
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break;
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filename[ strlen(filename) - 1 ]= 'U' + i;
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}
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if(codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
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infer_size(&codec->width, &codec->height, size[0]);
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} else {
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f[0] = s1->pb;
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if (f[0]->eof_reached)
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return AVERROR(EIO);
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size[0]= 4096;
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}
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av_new_packet(pkt, size[0] + size[1] + size[2]);
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pkt->stream_index = 0;
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->size= 0;
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for(i=0; i<3; i++){
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if(size[i]){
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ret[i]= avio_read(f[i], pkt->data + pkt->size, size[i]);
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if (!s->is_pipe)
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avio_close(f[i]);
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if(ret[i]>0)
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pkt->size += ret[i];
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}
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}
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if (ret[0] <= 0 || ret[1]<0 || ret[2]<0) {
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av_free_packet(pkt);
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return AVERROR(EIO); /* signal EOF */
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} else {
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s->img_count++;
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s->img_number++;
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return 0;
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}
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}
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#define OFFSET(x) offsetof(VideoDemuxData, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{ "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
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{ "video_size", "", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
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{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
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{ "loop", "", OFFSET(loop), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, DEC },
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{ "start_number", "first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.dbl = 1}, 1, INT_MAX, DEC },
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{ NULL },
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};
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#if CONFIG_IMAGE2_DEMUXER
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static const AVClass img2_class = {
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.class_name = "image2 demuxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_image2_demuxer = {
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.name = "image2",
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.long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
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.priv_data_size = sizeof(VideoDemuxData),
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.read_probe = read_probe,
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.read_header = read_header,
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.read_packet = read_packet,
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.flags = AVFMT_NOFILE,
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.priv_class = &img2_class,
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};
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#endif
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#if CONFIG_IMAGE2PIPE_DEMUXER
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static const AVClass img2pipe_class = {
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.class_name = "image2pipe demuxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_image2pipe_demuxer = {
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.name = "image2pipe",
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.long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
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.priv_data_size = sizeof(VideoDemuxData),
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.read_header = read_header,
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.read_packet = read_packet,
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.priv_class = &img2pipe_class,
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};
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#endif
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