mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
259 lines
7.4 KiB
C
259 lines
7.4 KiB
C
/*
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* Copyright (c) 2015 Matthieu Bouron <matthieu.bouron stupeflix.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include "libavformat/avformat.h"
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#include "libavutil/pixdesc.h"
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#include "libavcodec/internal.h"
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#include "libavutil/avassert.h"
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#include "libavutil/opt.h"
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static int try_decode_video_frame(AVCodecContext *codec_ctx, AVPacket *pkt, int decode)
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{
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int ret = 0;
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int got_frame = 0;
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AVFrame *frame = NULL;
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int skip_frame = codec_ctx->skip_frame;
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if (!avcodec_is_open(codec_ctx)) {
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const AVCodec *codec = avcodec_find_decoder(codec_ctx->codec_id);
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ret = avcodec_open2(codec_ctx, codec, NULL);
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if (ret < 0) {
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av_log(codec_ctx, AV_LOG_ERROR, "Failed to open codec\n");
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goto end;
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}
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}
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frame = av_frame_alloc();
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if (!frame) {
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av_log(NULL, AV_LOG_ERROR, "Failed to allocate frame\n");
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goto end;
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}
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if (!decode && codec_ctx->codec->caps_internal & FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM) {
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codec_ctx->skip_frame = AVDISCARD_ALL;
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}
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do {
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ret = avcodec_decode_video2(codec_ctx, frame, &got_frame, pkt);
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av_assert0(decode || (!decode && !got_frame));
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if (ret < 0)
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break;
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pkt->data += ret;
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pkt->size -= ret;
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if (got_frame) {
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break;
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}
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} while (pkt->size > 0);
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end:
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codec_ctx->skip_frame = skip_frame;
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av_frame_free(&frame);
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return ret;
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}
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static int find_video_stream_info(AVFormatContext *fmt_ctx, int decode)
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{
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int ret = 0;
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int i, done = 0;
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AVPacket pkt;
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av_init_packet(&pkt);
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while (!done) {
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AVCodecContext *codec_ctx = NULL;
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AVStream *st;
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if ((ret = av_read_frame(fmt_ctx, &pkt)) < 0) {
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av_log(fmt_ctx, AV_LOG_ERROR, "Failed to read frame\n");
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goto end;
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}
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st = fmt_ctx->streams[pkt.stream_index];
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codec_ctx = st->codec;
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/* Writing to AVStream.codec_info_nb_frames must not be done by
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* user applications. It is done here for testing purposing as
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* find_video_stream_info tries to mimic avformat_find_stream_info
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* which writes to this field.
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* */
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if (codec_ctx->codec_type != AVMEDIA_TYPE_VIDEO ||
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st->codec_info_nb_frames++ > 0) {
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av_packet_unref(&pkt);
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continue;
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}
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ret = try_decode_video_frame(codec_ctx, &pkt, decode);
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if (ret < 0) {
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av_log(fmt_ctx, AV_LOG_ERROR, "Failed to decode video frame\n");
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goto end;
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}
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av_packet_unref(&pkt);
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/* check if all video streams have demuxed a packet */
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done = 1;
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for (i = 0; i < fmt_ctx->nb_streams; i++) {
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st = fmt_ctx->streams[i];
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codec_ctx = st->codec;
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if (codec_ctx->codec_type != AVMEDIA_TYPE_VIDEO)
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continue;
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done &= st->codec_info_nb_frames > 0;
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}
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}
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end:
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av_packet_unref(&pkt);
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/* close all codecs opened in try_decode_video_frame */
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for (i = 0; i < fmt_ctx->nb_streams; i++) {
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AVStream *st = fmt_ctx->streams[i];
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avcodec_close(st->codec);
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}
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return ret < 0;
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}
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static void dump_video_streams(const AVFormatContext *fmt_ctx, int decode)
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{
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int i;
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for (i = 0; i < fmt_ctx->nb_streams; i++) {
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const AVOption *opt = NULL;
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const AVStream *st = fmt_ctx->streams[i];
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AVCodecContext *codec_ctx = st->codec;
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printf("stream=%d, decode=%d\n", i, decode);
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while (opt = av_opt_next(codec_ctx, opt)) {
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uint8_t *str;
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if (opt->type == AV_OPT_TYPE_CONST)
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continue;
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if (!strcmp(opt->name, "frame_number"))
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continue;
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if (av_opt_get(codec_ctx, opt->name, 0, &str) >= 0) {
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printf(" %s=%s\n", opt->name, str);
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av_free(str);
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}
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}
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}
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}
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static int open_and_probe_video_streams(AVFormatContext **fmt_ctx, const char *filename, int decode)
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{
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int ret = 0;
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ret = avformat_open_input(fmt_ctx, filename, NULL, NULL);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Failed to open input '%s'", filename);
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goto end;
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}
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ret = find_video_stream_info(*fmt_ctx, decode);
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if (ret < 0) {
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goto end;
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}
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dump_video_streams(*fmt_ctx, decode);
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end:
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return ret;
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}
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static int check_video_streams(const AVFormatContext *fmt_ctx1, const AVFormatContext *fmt_ctx2)
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{
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int i;
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int ret = 0;
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av_assert0(fmt_ctx1->nb_streams == fmt_ctx2->nb_streams);
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for (i = 0; i < fmt_ctx1->nb_streams; i++) {
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const AVOption *opt = NULL;
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const AVStream *st1 = fmt_ctx1->streams[i];
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const AVStream *st2 = fmt_ctx2->streams[i];
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AVCodecContext *codec_ctx1 = st1->codec;
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AVCodecContext *codec_ctx2 = st2->codec;
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if (codec_ctx1->codec_type != AVMEDIA_TYPE_VIDEO)
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continue;
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while (opt = av_opt_next(codec_ctx1, opt)) {
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uint8_t *str1 = NULL, *str2 = NULL;
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if (opt->type == AV_OPT_TYPE_CONST)
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continue;
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if (!strcmp(opt->name, "frame_number"))
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continue;
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av_assert0(av_opt_get(codec_ctx1, opt->name, 0, &str1) >= 0);
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av_assert0(av_opt_get(codec_ctx2, opt->name, 0, &str2) >= 0);
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if (strcmp(str1, str2)) {
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av_log(NULL, AV_LOG_ERROR, "Field %s differs: %s %s", opt->name, str1, str2);
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ret = AVERROR(EINVAL);
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}
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av_free(str1);
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av_free(str2);
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}
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}
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return ret;
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}
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int main(int argc, char* argv[])
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{
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int ret = 0;
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AVFormatContext *fmt_ctx = NULL;
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AVFormatContext *fmt_ctx_no_decode = NULL;
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av_register_all();
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if (argc < 2) {
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av_log(NULL, AV_LOG_ERROR, "Usage: %s <input>\n", argv[0]);
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return -1;
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}
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if ((ret = open_and_probe_video_streams(&fmt_ctx_no_decode, argv[1], 0)) < 0) {
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av_log(NULL, AV_LOG_ERROR, "Failed to probe '%s' without frame decoding\n", argv[1]);
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goto end;
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}
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if ((ret = open_and_probe_video_streams(&fmt_ctx, argv[1], 1)) < 0) {
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av_log(NULL, AV_LOG_ERROR, "Failed to probe '%s' with frame decoding\n", argv[1]);
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goto end;
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}
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ret = check_video_streams(fmt_ctx, fmt_ctx_no_decode);
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end:
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avformat_close_input(&fmt_ctx);
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avformat_close_input(&fmt_ctx_no_decode);
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return ret;
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}
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