* Decode one audio frame from the input file. * @param frame Audio frame to be decoded * @param input_format_context Format context of the input file * @param input_codec_context Codec context of the input file * @param[out] data_present Indicates whether data has been decoded * @param[out] finished Indicates whether the end of file has *
| 368 | * @return Error code (0 if successful) |
| 369 | */ |
| 370 | static int decode_audio_frame(AVFrame *frame, |
| 371 | AVFormatContext *input_format_context, |
| 372 | AVCodecContext *input_codec_context, |
| 373 | int *data_present, int *finished) |
| 374 | { |
| 375 | /* Packet used for temporary storage. */ |
| 376 | AVPacket *input_packet; |
| 377 | int error; |
| 378 | |
| 379 | error = init_packet(&input_packet); |
| 380 | if (error < 0) |
| 381 | return error; |
| 382 | |
| 383 | *data_present = 0; |
| 384 | *finished = 0; |
| 385 | /* Read one audio frame from the input file into a temporary packet. */ |
| 386 | if ((error = av_read_frame(input_format_context, input_packet)) < 0) { |
| 387 | /* If we are at the end of the file, flush the decoder below. */ |
| 388 | if (error == AVERROR_EOF) |
| 389 | *finished = 1; |
| 390 | else { |
| 391 | fprintf(stderr, "Could not read frame (error '%s')\n", |
| 392 | av_err2str(error)); |
| 393 | goto cleanup; |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | /* Send the audio frame stored in the temporary packet to the decoder. |
| 398 | * The input audio stream decoder is used to do this. */ |
| 399 | if ((error = avcodec_send_packet(input_codec_context, input_packet)) < 0) { |
| 400 | fprintf(stderr, "Could not send packet for decoding (error '%s')\n", |
| 401 | av_err2str(error)); |
| 402 | goto cleanup; |
| 403 | } |
| 404 | |
| 405 | /* Receive one frame from the decoder. */ |
| 406 | error = avcodec_receive_frame(input_codec_context, frame); |
| 407 | /* If the decoder asks for more data to be able to decode a frame, |
| 408 | * return indicating that no data is present. */ |
| 409 | if (error == AVERROR(EAGAIN)) { |
| 410 | error = 0; |
| 411 | goto cleanup; |
| 412 | /* If the end of the input file is reached, stop decoding. */ |
| 413 | } else if (error == AVERROR_EOF) { |
| 414 | *finished = 1; |
| 415 | error = 0; |
| 416 | goto cleanup; |
| 417 | } else if (error < 0) { |
| 418 | fprintf(stderr, "Could not decode frame (error '%s')\n", |
| 419 | av_err2str(error)); |
| 420 | goto cleanup; |
| 421 | /* Default case: Return decoded data. */ |
| 422 | } else { |
| 423 | *data_present = 1; |
| 424 | goto cleanup; |
| 425 | } |
| 426 | |
| 427 | cleanup: |
no test coverage detected