示例#1
0
static size_t write_samples(sox_format_t * const ft, sox_sample_t const * const sampleBuffer, size_t const len)
{
  priv_t * p = (priv_t *)ft->priv;
  unsigned i;

  for (i = 0; i < len; ++i) {
    SOX_SAMPLE_LOCALS;
    long pcm = SOX_SAMPLE_TO_SIGNED_32BIT(sampleBuffer[i], ft->clips);
    p->decoded_samples[i] = pcm >> (32 - p->bits_per_sample);
    switch (p->bits_per_sample) {
      case  8: p->decoded_samples[i] =
          SOX_SAMPLE_TO_SIGNED_8BIT(sampleBuffer[i], ft->clips);
        break;
      case 16: p->decoded_samples[i] =
          SOX_SAMPLE_TO_SIGNED_16BIT(sampleBuffer[i], ft->clips);
        break;
      case 24: p->decoded_samples[i] = /* sign extension: */
          SOX_SAMPLE_TO_SIGNED_24BIT(sampleBuffer[i],ft->clips) << 8;
        p->decoded_samples[i] >>= 8;
        break;
      case 32: p->decoded_samples[i] =
          SOX_SAMPLE_TO_SIGNED_32BIT(sampleBuffer[i],ft->clips);
        break;
    }
  }
  FLAC__stream_encoder_process_interleaved(p->encoder, p->decoded_samples, (unsigned) len / ft->signal.channels);
  return FLAC__stream_encoder_get_state(p->encoder) == FLAC__STREAM_ENCODER_OK ? len : 0;
}
示例#2
0
文件: flac.c 项目: Emisense/eTracks
static int start_write(sox_format_t * const ft)
{
  priv_t * p = (priv_t *)ft->priv;
  FLAC__StreamEncoderState status;
  unsigned compression_level = MAX_COMPRESSION; /* Default to "best" */

  if (ft->encoding.compression != HUGE_VAL) {
    compression_level = ft->encoding.compression;
    if (compression_level != ft->encoding.compression ||
        compression_level > MAX_COMPRESSION) {
      lsx_fail_errno(ft, SOX_EINVAL,
                 "FLAC compression level must be a whole number from 0 to %i",
                 MAX_COMPRESSION);
      return SOX_EOF;
    }
  }

  p->encoder = FLAC__stream_encoder_new();
  if (p->encoder == NULL) {
    lsx_fail_errno(ft, SOX_ENOMEM, "FLAC ERROR creating the encoder instance");
    return SOX_EOF;
  }
  p->decoded_samples = lsx_malloc(sox_globals.bufsiz * sizeof(FLAC__int32));

  p->bits_per_sample = ft->encoding.bits_per_sample;

  lsx_report("encoding at %i bits per sample", p->bits_per_sample);

  FLAC__stream_encoder_set_channels(p->encoder, ft->signal.channels);
  FLAC__stream_encoder_set_bits_per_sample(p->encoder, p->bits_per_sample);
  FLAC__stream_encoder_set_sample_rate(p->encoder, (unsigned)(ft->signal.rate + .5));

  { /* Check if rate is streamable: */
    static const unsigned streamable_rates[] =
      {8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000};
    size_t i;
    sox_bool streamable = sox_false;
    for (i = 0; !streamable && i < array_length(streamable_rates); ++i)
       streamable = (streamable_rates[i] == ft->signal.rate);
    if (!streamable) {
      lsx_report("non-standard rate; output may not be streamable");
      FLAC__stream_encoder_set_streamable_subset(p->encoder, sox_false);
    }
  }

#if FLAC_API_VERSION_CURRENT >= 10
  FLAC__stream_encoder_set_compression_level(p->encoder, compression_level);
#else
  {
    static struct {
      unsigned blocksize;
      FLAC__bool do_exhaustive_model_search;
      FLAC__bool do_mid_side_stereo;
      FLAC__bool loose_mid_side_stereo;
      unsigned max_lpc_order;
      unsigned max_residual_partition_order;
      unsigned min_residual_partition_order;
    } const options[MAX_COMPRESSION + 1] = {
      {1152, sox_false, sox_false, sox_false, 0, 2, 2},
      {1152, sox_false, sox_true, sox_true, 0, 2, 2},
      {1152, sox_false, sox_true, sox_false, 0, 3, 0},
      {4608, sox_false, sox_false, sox_false, 6, 3, 3},
      {4608, sox_false, sox_true, sox_true, 8, 3, 3},
      {4608, sox_false, sox_true, sox_false, 8, 3, 3},
      {4608, sox_false, sox_true, sox_false, 8, 4, 0},
      {4608, sox_true, sox_true, sox_false, 8, 6, 0},
      {4608, sox_true, sox_true, sox_false, 12, 6, 0},
    };
#define SET_OPTION(x) do {\
  lsx_report(#x" = %i", options[compression_level].x); \
  FLAC__stream_encoder_set_##x(p->encoder, options[compression_level].x);\
} while (0)
    SET_OPTION(blocksize);
    SET_OPTION(do_exhaustive_model_search);
    SET_OPTION(max_lpc_order);
    SET_OPTION(max_residual_partition_order);
    SET_OPTION(min_residual_partition_order);
    if (ft->signal.channels == 2) {
      SET_OPTION(do_mid_side_stereo);
      SET_OPTION(loose_mid_side_stereo);
    }
#undef SET_OPTION
  }
#endif

  if (ft->signal.length != 0) {
    FLAC__stream_encoder_set_total_samples_estimate(p->encoder, (FLAC__uint64)(ft->signal.length / ft->signal.channels));

    p->metadata[p->num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE);
    if (p->metadata[p->num_metadata] == NULL) {
      lsx_fail_errno(ft, SOX_ENOMEM, "FLAC ERROR creating the encoder seek table template");
      return SOX_EOF;
    }
    {
#if FLAC_API_VERSION_CURRENT >= 8
      if (!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(p->metadata[p->num_metadata], (unsigned)(10 * ft->signal.rate + .5), (FLAC__uint64)(ft->signal.length/ft->signal.channels))) {
#else
      size_t samples = 10 * ft->signal.rate;
      size_t total_samples = ft->signal.length/ft->signal.channels;
      if (!FLAC__metadata_object_seektable_template_append_spaced_points(p->metadata[p->num_metadata], total_samples / samples + (total_samples % samples != 0), (FLAC__uint64)total_samples)) {
#endif
        lsx_fail_errno(ft, SOX_ENOMEM, "FLAC ERROR creating the encoder seek table points");
        return SOX_EOF;
      }
    }
    p->metadata[p->num_metadata]->is_last = sox_false; /* the encoder will set this for us */
    ++p->num_metadata;
  }

  if (ft->oob.comments) {     /* Make the comment structure */
    FLAC__StreamMetadata_VorbisComment_Entry entry;
    int i;

    p->metadata[p->num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
    for (i = 0; ft->oob.comments[i]; ++i) {
      static const char prepend[] = "Comment=";
      char * text = lsx_calloc(strlen(prepend) + strlen(ft->oob.comments[i]) + 1, sizeof(*text));
      /* Prepend `Comment=' if no field-name already in the comment */
      if (!strchr(ft->oob.comments[i], '='))
        strcpy(text, prepend);
      entry.entry = (FLAC__byte *) strcat(text, ft->oob.comments[i]);
      entry.length = strlen(text);
      FLAC__metadata_object_vorbiscomment_append_comment(p->metadata[p->num_metadata], entry, /*copy= */ sox_true);
      free(text);
    }
    ++p->num_metadata;
  }

  if (p->num_metadata)
    FLAC__stream_encoder_set_metadata(p->encoder, p->metadata, p->num_metadata);

#if FLAC_API_VERSION_CURRENT <= 7
  FLAC__stream_encoder_set_write_callback(p->encoder, flac_stream_encoder_write_callback);
  FLAC__stream_encoder_set_metadata_callback(p->encoder, flac_stream_encoder_metadata_callback);
  FLAC__stream_encoder_set_client_data(p->encoder, ft);
  status = FLAC__stream_encoder_init(p->encoder);
#else
  status = FLAC__stream_encoder_init_stream(p->encoder, flac_stream_encoder_write_callback,
      flac_stream_encoder_seek_callback, flac_stream_encoder_tell_callback, flac_stream_encoder_metadata_callback, ft);
#endif

  if (status != FLAC__STREAM_ENCODER_OK) {
    lsx_fail_errno(ft, SOX_EINVAL, "%s", FLAC__StreamEncoderStateString[status]);
    return SOX_EOF;
  }
  return SOX_SUCCESS;
}



static size_t write_samples(sox_format_t * const ft, sox_sample_t const * const sampleBuffer, size_t const len)
{
  priv_t * p = (priv_t *)ft->priv;
  unsigned i;

  for (i = 0; i < len; ++i) {
    long pcm = SOX_SAMPLE_TO_SIGNED_32BIT(sampleBuffer[i], ft->clips);
    p->decoded_samples[i] = pcm >> (32 - p->bits_per_sample);
    switch (p->bits_per_sample) {
      case  8: p->decoded_samples[i] =
          SOX_SAMPLE_TO_SIGNED_8BIT(sampleBuffer[i], ft->clips);
        break;
      case 16: p->decoded_samples[i] =
          SOX_SAMPLE_TO_SIGNED_16BIT(sampleBuffer[i], ft->clips);
        break;
      case 24: p->decoded_samples[i] = /* sign extension: */
          SOX_SAMPLE_TO_SIGNED_24BIT(sampleBuffer[i],ft->clips) << 8;
        p->decoded_samples[i] >>= 8;
        break;
      case 32: p->decoded_samples[i] =
          SOX_SAMPLE_TO_SIGNED_32BIT(sampleBuffer[i],ft->clips);
        break;
    }
  }
  FLAC__stream_encoder_process_interleaved(p->encoder, p->decoded_samples, (unsigned) len / ft->signal.channels);
  return FLAC__stream_encoder_get_state(p->encoder) == FLAC__STREAM_ENCODER_OK ? len : 0;
}