Beispiel #1
0
/** Convert an audio file to an AAC file in an MP4 container. */
int compress(int argc, char **argv)
{
    AVFormatContext *input_format_context = NULL, *output_format_context = NULL;
    AVCodecContext *input_codec_context = NULL, *output_codec_context = NULL;
    SwrContext *resample_context = NULL;
    AVAudioFifo *fifo = NULL;
    int ret = AVERROR_EXIT;

    if (argc < 3) {
        fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
        exit(1);
    }

    const char *input_filename = argv[1];
    const char *output_filename = argv[2];

    /** Register all codecs and formats so that they can be used. */
    av_register_all();
    /** Open the input file for reading. */
    if (open_input_file(input_filename, &input_format_context, &input_codec_context))
        goto cleanup;

    /** Open the output file for writing. */
    if (open_output_file(output_filename, input_codec_context, &output_format_context, &output_codec_context))
        goto cleanup;

    /** Initialize the resampler to be able to convert audio sample formats. */
    if (init_resampler(input_codec_context, output_codec_context, &resample_context))
        goto cleanup;

    /** Initialize the FIFO buffer to store audio samples to be encoded. */
    if (init_fifo(&fifo, output_codec_context))
        goto cleanup;

    /** Write the header of the output file container. */
    if (write_output_file_header(output_format_context))
        goto cleanup;

    /**
     * Loop as long as we have input samples to read or output samples
     * to write; abort as soon as we have neither.
     */
    while (1) {
        /** Use the encoder's desired frame size for processing. */
        const int output_frame_size = output_codec_context->frame_size;
        int finished                = 0;

        /**
         * Make sure that there is one frame worth of samples in the FIFO
         * buffer so that the encoder can do its work.
         * Since the decoder's and the encoder's frame size may differ, we
         * need to FIFO buffer to store as many frames worth of input samples
         * that they make up at least one frame worth of output samples.
         */
        while (av_audio_fifo_size(fifo) < output_frame_size) {
            /**
             * Decode one frame worth of audio samples, convert it to the
             * output sample format and put it into the FIFO buffer.
             */
            if (read_decode_convert_and_store(fifo, input_format_context,
                                              input_codec_context,
                                              output_codec_context,
                                              resample_context, &finished))
                goto cleanup;

            /**
             * If we are at the end of the input file, we continue
             * encoding the remaining audio samples to the output file.
             */
            if (finished)
                break;
        }

        /**
         * If we have enough samples for the encoder, we encode them.
         * At the end of the file, we pass the remaining samples to
         * the encoder.
         */
        while (av_audio_fifo_size(fifo) >= output_frame_size ||
               (finished && av_audio_fifo_size(fifo) > 0))
            /**
             * Take one frame worth of audio samples from the FIFO buffer,
             * encode it and write it to the output file.
             */
            if (load_encode_and_write(fifo, output_format_context, output_codec_context))
                goto cleanup;

        /**
         * If we are at the end of the input file and have encoded
         * all remaining samples, we can exit this loop and finish.
         */
        if (finished) {
            int data_written;
            /** Flush the encoder as it may have delayed frames. */
            do {
                if (encode_audio_frame(NULL, output_format_context, output_codec_context, &data_written))
                    goto cleanup;
            } while (data_written);
            break;
        }
    }

    /** Write the trailer of the output file container. */
    if (write_output_file_trailer(output_format_context))
        goto cleanup;
    ret = 0;

cleanup:
    if (fifo)
        av_audio_fifo_free(fifo);
    swr_free(&resample_context);
    if (output_codec_context)
        avcodec_close(output_codec_context);
    if (output_format_context) {
        avio_closep(&output_format_context->pb);
        avformat_free_context(output_format_context);
    }
    if (input_codec_context)
        avcodec_close(input_codec_context);
    if (input_format_context)
        avformat_close_input(&input_format_context);

    return ret;
}
Beispiel #2
0
/**
 * 
 * @param orig
 * @param dest
 * @return 
 */
int Transcode::transcode(string orig, string dest, TID3Tags *tags)
{
    AVFormatContext *input_format_context = NULL, *output_format_context = NULL;
    AVCodecContext *input_codec_context = NULL, *output_codec_context = NULL;
    SwrContext *resample_context = NULL;
    AVAudioFifo *fifo = NULL;
    int ret = AVERROR_EXIT;
    this->pts = 0;

    if (orig.empty() || dest.empty()) {
        fprintf(stderr, "Files to process not especified\n");
        return ret;
    }

    /* Register all codecs and formats so that they can be used. */
    av_register_all();
    /* Open the input file for reading. */
    if (open_input_file(orig.c_str(), &input_format_context,
                        &input_codec_context))
        goto cleanup;
    /* Open the output file for writing. */
    if (open_output_file(dest.c_str(), input_codec_context,
                         &output_format_context, &output_codec_context))
        goto cleanup;
    
    /**Copy the metadata if exist*/
    copy_metadata(input_format_context, output_format_context, tags);
    
    
    /* Initialize the resampler to be able to convert audio sample formats. */
    if (init_resampler(input_codec_context, output_codec_context,
                       &resample_context))
        goto cleanup;
    /* Initialize the FIFO buffer to store audio samples to be encoded. */
    if (init_fifo(&fifo, output_codec_context))
        goto cleanup;
    /* Write the header of the output file container. */
    if (write_output_file_header(output_format_context))
        goto cleanup;

    /* Loop as long as we have input samples to read or output samples
     * to write; abort as soon as we have neither. */
    while (1) {
        /* Use the encoder's desired frame size for processing. */
        const int output_frame_size = output_codec_context->frame_size;
        int finished                = 0;

        /* Make sure that there is one frame worth of samples in the FIFO
         * buffer so that the encoder can do its work.
         * Since the decoder's and the encoder's frame size may differ, we
         * need to FIFO buffer to store as many frames worth of input samples
         * that they make up at least one frame worth of output samples. */
        while (av_audio_fifo_size(fifo) < output_frame_size) {
            /* Decode one frame worth of audio samples, convert it to the
             * output sample format and put it into the FIFO buffer. */
            if (read_decode_convert_and_store(fifo, input_format_context,
                                              input_codec_context,
                                              output_codec_context,
                                              resample_context, &finished))
                goto cleanup;

            /* If we are at the end of the input file, we continue
             * encoding the remaining audio samples to the output file. */
            if (finished)
                break;
        }

        /* If we have enough samples for the encoder, we encode them.
         * At the end of the file, we pass the remaining samples to
         * the encoder. */
        while (av_audio_fifo_size(fifo) >= output_frame_size ||
               (finished && av_audio_fifo_size(fifo) > 0))
            /* Take one frame worth of audio samples from the FIFO buffer,
             * encode it and write it to the output file. */
            if (load_encode_and_write(fifo, output_format_context,
                                      output_codec_context))
                goto cleanup;

        /* If we are at the end of the input file and have encoded
         * all remaining samples, we can exit this loop and finish. */
        if (finished) {
            int data_written;
            /* Flush the encoder as it may have delayed frames. */
            do {
                if (encode_audio_frame(NULL, output_format_context,
                                       output_codec_context, &data_written))
                    goto cleanup;
            } while (data_written);
            break;
        }
    }

    /* Write the trailer of the output file container. */
    if (write_output_file_trailer(output_format_context))
        goto cleanup;
    ret = 0;

cleanup:
    if (fifo)
        av_audio_fifo_free(fifo);
    swr_free(&resample_context);
    if (output_codec_context)
        avcodec_free_context(&output_codec_context);
    if (output_format_context) {
        avio_closep(&output_format_context->pb);
        avformat_free_context(output_format_context);
    }
    if (input_codec_context)
        avcodec_free_context(&input_codec_context);
    if (input_format_context)
        avformat_close_input(&input_format_context);

    return ret;
}