/* * Copyright (c) 2015 Ludmila Glinskih * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /** * H264 codec test. */ #include "libavutil/adler32.h"#include "libavutil/mem.h"#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libavutil/imgutils.h"#include "libavutil/timestamp.h" static int video_decode_example(const char *input_filename){    const AVCodec *codec = NULL;    AVCodecContext *ctx= NULL;    AVCodecParameters *origin_par = NULL;    AVFrame *fr = NULL;    uint8_t *byte_buffer = NULL;    AVPacket *pkt;    AVFormatContext *fmt_ctx = NULL;    int number_of_written_bytes;    int video_stream;    int byte_buffer_size;    int i = 0;    int result;     result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);    if (result < 0) {        av_log(NULL, AV_LOG_ERROR, "Can't open file\n");        return result;    }     result = avformat_find_stream_info(fmt_ctx, NULL);    if (result < 0) {        av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");        return result;    }     video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);    if (video_stream < 0) {      av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");      return -1;    }     origin_par = fmt_ctx->streams[video_stream]->codecpar;     codec = avcodec_find_decoder(origin_par->codec_id);    if (!codec) {        av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");        return -1;    }     ctx = avcodec_alloc_context3(codec);    if (!ctx) {        av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");        return AVERROR(ENOMEM);    }     result = avcodec_parameters_to_context(ctx, origin_par);    if (result) {        av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");        return result;    }     result = avcodec_open2(ctx, codec, NULL);    if (result < 0) {        av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");        return result;    }     fr = av_frame_alloc();    if (!fr) {        av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");        return AVERROR(ENOMEM);    }     pkt = av_packet_alloc();    if (!pkt) {        av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");        return AVERROR(ENOMEM);    }     byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);    byte_buffer = av_malloc(byte_buffer_size);    if (!byte_buffer) {        av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");        return AVERROR(ENOMEM);    }     printf("#tb %d: %d/%d\n", video_stream, fmt_ctx->streams[video_stream]->time_base.num, fmt_ctx->streams[video_stream]->time_base.den);    i = 0;     result = 0;    while (result >= 0) {        result = av_read_frame(fmt_ctx, pkt);        if (result >= 0 && pkt->stream_index != video_stream) {            av_packet_unref(pkt);            continue;        }         if (result < 0)            result = avcodec_send_packet(ctx, NULL);        else {            if (pkt->pts == AV_NOPTS_VALUE)                pkt->pts = pkt->dts = i;            result = avcodec_send_packet(ctx, pkt);        }        av_packet_unref(pkt);         if (result < 0) {            av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");            return result;        }         while (result >= 0) {            result = avcodec_receive_frame(ctx, fr);            if (result == AVERROR_EOF)                goto finish;            else if (result == AVERROR(EAGAIN)) {                result = 0;                break;            } else if (result < 0) {                av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");                return result;            }             number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,                                    (const uint8_t* const *)fr->data, (const int*) fr->linesize,                                    ctx->pix_fmt, ctx->width, ctx->height, 1);            if (number_of_written_bytes < 0) {                av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");                av_frame_unref(fr);                return number_of_written_bytes;            }            printf("%d, %s, %s, %8"PRId64", %8d, 0x%08"PRIx32"\n", video_stream,                   av_ts2str(fr->pts), av_ts2str(fr->pkt_dts), fr->duration,                   number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));             av_frame_unref(fr);        }        i++;    } finish:    av_packet_free(&pkt);    av_frame_free(&fr);    avformat_close_input(&fmt_ctx);    avcodec_free_context(&ctx);    av_freep(&byte_buffer);    return 0;} int main(int argc, char **argv){    if (argc < 2)    {        av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");        return 1;    }     if (video_decode_example(argv[1]) != 0)        return 1;     return 0;}