av_free_packet 예제들

할일: ManagedDecoder.cpp에서, decodingRTSP에서 2종류의 avpacket을 한번만 선언해서 사용하기

pkt을 한번만 선언해서 av_free_packet(.)해도 계속 사용하는 사례

2015년에 작성된 H264 codec test 샘플코드임.

https://ffmpeg.org/doxygen/2.8/api-h264-test_8c_source.html#l00032

106  i = 0;

107  av_init_packet(&pkt);

108  do {

109  if (!end_of_stream)

110  if (av_read_frame(fmt_ctx, &pkt) < 0)

111  end_of_stream = 1;

112  if (end_of_stream) {

113  pkt.data = NULL;

114  pkt.size = 0;

115  }

116  if (pkt.stream_index == video_stream || end_of_stream) {

117  got_frame = 0;

118  if (pkt.pts == AV_NOPTS_VALUE)

119  pkt.pts = pkt.dts = i;

120  result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);

121  if (result < 0) {

122  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");

123  return result;

124  }

125  if (got_frame) {

126  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,

127  (const uint8_t* const *)fr->data, (const int*) fr->linesize,

128  ctx->pix_fmt, ctx->width, ctx->height, 1);

129  if (number_of_written_bytes < 0) {

130  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");

131  return number_of_written_bytes;

132  }

133  printf("%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, 0x%08lx\n", video_stream,

134  fr->pkt_pts, fr->pkt_dts, av_frame_get_pkt_duration(fr),

135  number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));

136  }

137  av_free_packet(&pkt);

138  av_init_packet(&pkt);

139  }

140  i++;

141  } while (!end_of_stream || got_frame);

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https://ffmpeg.org/doxygen/2.8/decoding__encoding_8c_source.html#l00347