tests/api/api-h264-test.c

   1 /*
   2  * Copyright (c) 2015 Ludmila Glinskih
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  20  * THE SOFTWARE.
  21  */
  22
  23 /**
  24  * H264 codec test.
  25  */
  26
  27 #include "libavutil/adler32.h"
  28 #include "libavutil/mem.h"
  29 #include "libavcodec/avcodec.h"
  30 #include "libavformat/avformat.h"
  31 #include "libavutil/imgutils.h"
  32 #include "libavutil/timestamp.h"
  33
  34 static int video_decode_example(const char *input_filename)
  35 {
  36     const AVCodec *codec = NULL;
  37     AVCodecContext *ctx= NULL;
  38     AVCodecParameters *origin_par = NULL;
  39     AVFrame *fr = NULL;
  40     uint8_t *byte_buffer = NULL;
  41     AVPacket *pkt;
  42     AVFormatContext *fmt_ctx = NULL;
  43     int number_of_written_bytes;
  44     int video_stream;
  45     int byte_buffer_size;
  46     int i = 0;
  47     int result;
  48
  49     result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
  50     if (result < 0) {
  51         av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
  52         return result;
  53     }
  54
  55     result = avformat_find_stream_info(fmt_ctx, NULL);
  56     if (result < 0) {
  57         av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
  58         return result;
  59     }
  60
  61     video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
  62     if (video_stream < 0) {
  63       av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
  64       return -1;
  65     }
  66
  67     origin_par = fmt_ctx->streams[video_stream]->codecpar;
  68
  69     codec = avcodec_find_decoder(origin_par->codec_id);
  70     if (!codec) {
  71         av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
  72         return -1;
  73     }
  74
  75     ctx = avcodec_alloc_context3(codec);
  76     if (!ctx) {
  77         av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
  78         return AVERROR(ENOMEM);
  79     }
  80
  81     result = avcodec_parameters_to_context(ctx, origin_par);
  82     if (result) {
  83         av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
  84         return result;
  85     }
  86
  87     result = avcodec_open2(ctx, codec, NULL);
  88     if (result < 0) {
  89         av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
  90         return result;
  91     }
  92
  93     fr = av_frame_alloc();
  94     if (!fr) {
  95         av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
  96         return AVERROR(ENOMEM);
  97     }
  98
  99     pkt = av_packet_alloc();
 100     if (!pkt) {
 101         av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
 102         return AVERROR(ENOMEM);
 103     }
 104
 105     byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
 106     byte_buffer = av_malloc(byte_buffer_size);
 107     if (!byte_buffer) {
 108         av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
 109         return AVERROR(ENOMEM);
 110     }
 111
 112     printf("#tb %d: %d/%d\n", video_stream, fmt_ctx->streams[video_stream]->time_base.num, fmt_ctx->streams[video_stream]->time_base.den);
 113     i = 0;
 114
 115     result = 0;
 116     while (result >= 0) {
 117         result = av_read_frame(fmt_ctx, pkt);
 118         if (result >= 0 && pkt->stream_index != video_stream) {
 119             av_packet_unref(pkt);
 120             continue;
 121         }
 122
 123         if (result < 0)
 124             result = avcodec_send_packet(ctx, NULL);
 125         else {
 126             if (pkt->pts == AV_NOPTS_VALUE)
 127                 pkt->pts = pkt->dts = i;
 128             result = avcodec_send_packet(ctx, pkt);
 129         }
 130         av_packet_unref(pkt);
 131
 132         if (result < 0) {
 133             av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
 134             return result;
 135         }
 136
 137         while (result >= 0) {
 138             result = avcodec_receive_frame(ctx, fr);
 139             if (result == AVERROR_EOF)
 140                 goto finish;
 141             else if (result == AVERROR(EAGAIN)) {
 142                 result = 0;
 143                 break;
 144             } else if (result < 0) {
 145                 av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
 146                 return result;
 147             }
 148
 149             number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
 150                                     (const uint8_t* const *)fr->data, (const int*) fr->linesize,
 151                                     ctx->pix_fmt, ctx->width, ctx->height, 1);
 152             if (number_of_written_bytes < 0) {
 153                 av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
 154                 av_frame_unref(fr);
 155                 return number_of_written_bytes;
 156             }
 157             printf("%d, %10s, %10s, %8"PRId64", %8d, 0x%08"PRIx32"\n", video_stream,
 158                    av_ts2str(fr->pts), av_ts2str(fr->pkt_dts), fr->duration,
 159                    number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));
 160
 161             av_frame_unref(fr);
 162         }
 163         i++;
 164     }
 165
 166 finish:
 167     av_packet_free(&pkt);
 168     av_frame_free(&fr);
 169     avformat_close_input(&fmt_ctx);
 170     avcodec_free_context(&ctx);
 171     av_freep(&byte_buffer);
 172     return 0;
 173 }
 174
 175 int main(int argc, char **argv)
 176 {
 177     if (argc < 2)
 178     {
 179         av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
 180         return 1;
 181     }
 182
 183     if (video_decode_example(argv[1]) != 0)
 184         return 1;
 185
 186     return 0;
 187 }