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@@ -216,10 +216,9 @@ static void print_frame(const AVFrame *frame) |
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int main(int argc, char **argv) |
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{ |
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int ret; |
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AVPacket packet0, packet; |
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AVPacket packet; |
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AVFrame *frame = av_frame_alloc(); |
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AVFrame *filt_frame = av_frame_alloc(); |
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int got_frame; |
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if (!frame || !filt_frame) { |
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perror("Could not allocate frame"); |
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@@ -239,50 +238,48 @@ int main(int argc, char **argv) |
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goto end; |
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/* read all packets */ |
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packet0.data = NULL; |
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packet.data = NULL; |
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while (1) { |
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if (!packet0.data) { |
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if ((ret = av_read_frame(fmt_ctx, &packet)) < 0) |
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break; |
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packet0 = packet; |
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} |
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if ((ret = av_read_frame(fmt_ctx, &packet)) < 0) |
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break; |
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if (packet.stream_index == audio_stream_index) { |
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got_frame = 0; |
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ret = avcodec_decode_audio4(dec_ctx, frame, &got_frame, &packet); |
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ret = avcodec_send_packet(dec_ctx, &packet); |
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if (ret < 0) { |
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av_log(NULL, AV_LOG_ERROR, "Error decoding audio\n"); |
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continue; |
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av_log(NULL, AV_LOG_ERROR, "Error while sending a packet to the decoder\n"); |
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break; |
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} |
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packet.size -= ret; |
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packet.data += ret; |
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if (got_frame) { |
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/* push the audio data from decoded frame into the filtergraph */ |
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if (av_buffersrc_add_frame_flags(buffersrc_ctx, frame, 0) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "Error while feeding the audio filtergraph\n"); |
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while (ret >= 0) { |
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ret = avcodec_receive_frame(dec_ctx, frame); |
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) { |
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break; |
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} else if (ret < 0) { |
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av_log(NULL, AV_LOG_ERROR, "Error while receiving a frame from the decoder\n"); |
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goto end; |
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} |
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/* pull filtered audio from the filtergraph */ |
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while (1) { |
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ret = av_buffersink_get_frame(buffersink_ctx, filt_frame); |
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) |
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if (ret >= 0) { |
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/* push the audio data from decoded frame into the filtergraph */ |
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if (av_buffersrc_add_frame_flags(buffersrc_ctx, frame, AV_BUFFERSRC_FLAG_KEEP_REF) < 0) { |
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av_log(NULL, AV_LOG_ERROR, "Error while feeding the audio filtergraph\n"); |
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break; |
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if (ret < 0) |
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goto end; |
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print_frame(filt_frame); |
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av_frame_unref(filt_frame); |
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} |
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/* pull filtered audio from the filtergraph */ |
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while (1) { |
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ret = av_buffersink_get_frame(buffersink_ctx, filt_frame); |
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) |
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break; |
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if (ret < 0) |
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goto end; |
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print_frame(filt_frame); |
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av_frame_unref(filt_frame); |
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} |
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av_frame_unref(frame); |
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} |
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} |
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if (packet.size <= 0) |
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av_packet_unref(&packet0); |
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} else { |
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/* discard non-wanted packets */ |
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av_packet_unref(&packet0); |
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} |
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av_packet_unref(&packet); |
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} |
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end: |
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avfilter_graph_free(&filter_graph); |
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