if (avctx->error_recognition >= FF_ER_CAREFUL) {
s->input_buffer = av_mallocz(AC3_FRAME_BUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
if (!s->input_buffer)
- return AVERROR_NOMEM;
+ return AVERROR(ENOMEM);
}
avctx->sample_fmt = SAMPLE_FMT_S16;
/* spectral extension strategy */
if (s->eac3 && (!blk || get_bits1(gbc))) {
- if (get_bits1(gbc)) {
- av_log_missing_feature(s->avctx, "Spectral extension", 1);
- return -1;
+ s->spx_in_use = get_bits1(gbc);
+ if (s->spx_in_use) {
+ int dst_start_freq, dst_end_freq, src_start_freq,
+ start_subband, end_subband;
+
+ /* determine which channels use spx */
+ if (s->channel_mode == AC3_CHMODE_MONO) {
+ s->channel_uses_spx[1] = 1;
+ } else {
+ for (ch = 1; ch <= fbw_channels; ch++)
+ s->channel_uses_spx[ch] = get_bits1(gbc);
+ }
+
+ /* get the frequency bins of the spx copy region and the spx start
+ and end subbands */
+ dst_start_freq = get_bits(gbc, 2);
+ start_subband = get_bits(gbc, 3) + 2;
+ if (start_subband > 7)
+ start_subband += start_subband - 7;
+ end_subband = get_bits(gbc, 3) + 5;
+ if (end_subband > 7)
+ end_subband += end_subband - 7;
+ dst_start_freq = dst_start_freq * 12 + 25;
+ src_start_freq = start_subband * 12 + 25;
+ dst_end_freq = end_subband * 12 + 25;
+
+ /* check validity of spx ranges */
+ if (start_subband >= end_subband) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
+ "range (%d >= %d)\n", start_subband, end_subband);
+ return -1;
+ }
+ if (dst_start_freq >= src_start_freq) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
+ "copy start bin (%d >= %d)\n", dst_start_freq, src_start_freq);
+ return -1;
+ }
+
+ s->spx_dst_start_freq = dst_start_freq;
+ s->spx_src_start_freq = src_start_freq;
+ s->spx_dst_end_freq = dst_end_freq;
+
+ decode_band_structure(gbc, blk, s->eac3, 0,
+ start_subband, end_subband,
+ ff_eac3_default_spx_band_struct,
+ &s->num_spx_bands,
+ s->spx_band_sizes);
+ } else {
+ for (ch = 1; ch <= fbw_channels; ch++) {
+ s->channel_uses_spx[ch] = 0;
+ s->first_spx_coords[ch] = 1;
+ }
}
- /* TODO: parse spectral extension strategy info */
}
- /* TODO: spectral extension coordinates */
+ /* spectral extension coordinates */
+ if (s->spx_in_use) {
+ for (ch = 1; ch <= fbw_channels; ch++) {
+ if (s->channel_uses_spx[ch]) {
+ if (s->first_spx_coords[ch] || get_bits1(gbc)) {
+ float spx_blend;
+ int bin, master_spx_coord;
+
+ s->first_spx_coords[ch] = 0;
+ spx_blend = get_bits(gbc, 5) * (1.0f/32);
+ master_spx_coord = get_bits(gbc, 2) * 3;
+
+ bin = s->spx_src_start_freq;
+ for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
+ int bandsize;
+ int spx_coord_exp, spx_coord_mant;
+ float nratio, sblend, nblend, spx_coord;
+
+ /* calculate blending factors */
+ bandsize = s->spx_band_sizes[bnd];
+ nratio = ((float)((bin + (bandsize >> 1))) / s->spx_dst_end_freq) - spx_blend;
+ nratio = av_clipf(nratio, 0.0f, 1.0f);
+ nblend = sqrtf(3.0f * nratio); // noise is scaled by sqrt(3) to give unity variance
+ sblend = sqrtf(1.0f - nratio);
+ bin += bandsize;
+
+ /* decode spx coordinates */
+ spx_coord_exp = get_bits(gbc, 4);
+ spx_coord_mant = get_bits(gbc, 2);
+ if (spx_coord_exp == 15) spx_coord_mant <<= 1;
+ else spx_coord_mant += 4;
+ spx_coord_mant <<= (25 - spx_coord_exp - master_spx_coord);
+ spx_coord = spx_coord_mant * (1.0f/(1<<23));
+
+ /* multiply noise and signal blending factors by spx coordinate */
+ s->spx_noise_blend [ch][bnd] = nblend * spx_coord;
+ s->spx_signal_blend[ch][bnd] = sblend * spx_coord;
+ }
+ }
+ } else {
+ s->first_spx_coords[ch] = 1;
+ }
+ }
+ }
/* coupling strategy */
if (s->eac3 ? s->cpl_strategy_exists[blk] : get_bits1(gbc)) {
s->phase_flags_in_use = get_bits1(gbc);
/* coupling frequency range */
- /* TODO: modify coupling end freq if spectral extension is used */
cpl_start_subband = get_bits(gbc, 4);
- cpl_end_subband = get_bits(gbc, 4) + 3;
+ cpl_end_subband = s->spx_in_use ? (s->spx_src_start_freq - 37) / 12 :
+ get_bits(gbc, 4) + 3;
if (cpl_start_subband >= cpl_end_subband) {
av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d >= %d)\n",
cpl_start_subband, cpl_end_subband);
if (channel_mode == AC3_CHMODE_STEREO) {
if ((s->eac3 && !blk) || get_bits1(gbc)) {
s->num_rematrixing_bands = 4;
- if(cpl_in_use && s->start_freq[CPL_CH] <= 61)
+ if (cpl_in_use && s->start_freq[CPL_CH] <= 61) {
s->num_rematrixing_bands -= 1 + (s->start_freq[CPL_CH] == 37);
+ } else if (s->spx_in_use && s->spx_src_start_freq <= 61) {
+ s->num_rematrixing_bands--;
+ }
for(bnd=0; bnd<s->num_rematrixing_bands; bnd++)
s->rematrixing_flags[bnd] = get_bits1(gbc);
} else if (!blk) {
int prev = s->end_freq[ch];
if (s->channel_in_cpl[ch])
s->end_freq[ch] = s->start_freq[CPL_CH];
+ else if (s->channel_uses_spx[ch])
+ s->end_freq[ch] = s->spx_src_start_freq;
else {
int bandwidth_code = get_bits(gbc, 6);
if (bandwidth_code > 60) {
/* TODO: generate enhanced coupling coordinates and uncouple */
- /* TODO: apply spectral extension */
-
/* recover coefficients if rematrixing is in use */
if(s->channel_mode == AC3_CHMODE_STEREO)
do_rematrixing(s);
s->dsp.int32_to_float_fmul_scalar(s->transform_coeffs[ch], s->fixed_coeffs[ch], gain, 256);
}
+ /* apply spectral extension to high frequency bins */
+ if (s->spx_in_use && CONFIG_EAC3_DECODER) {
+ ff_eac3_apply_spectral_extension(s);
+ }
+
/* downmix and MDCT. order depends on whether block switching is used for
any channel in this block. this is because coefficients for the long
and short transforms cannot be mixed. */
*data_size = 0;
err = parse_frame_header(s);
- /* check that reported frame size fits in input buffer */
- if(s->frame_size > buf_size) {
- av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
- err = AAC_AC3_PARSE_ERROR_FRAME_SIZE;
- }
-
- /* check for crc mismatch */
- if(err != AAC_AC3_PARSE_ERROR_FRAME_SIZE && avctx->error_recognition >= FF_ER_CAREFUL) {
- if(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, &buf[2], s->frame_size-2)) {
- av_log(avctx, AV_LOG_ERROR, "frame CRC mismatch\n");
- err = AAC_AC3_PARSE_ERROR_CRC;
- }
- }
-
- if(err && err != AAC_AC3_PARSE_ERROR_CRC) {
+ if (err) {
switch(err) {
case AAC_AC3_PARSE_ERROR_SYNC:
av_log(avctx, AV_LOG_ERROR, "frame sync error\n");
av_log(avctx, AV_LOG_ERROR, "invalid header\n");
break;
}
+ } else {
+ /* check that reported frame size fits in input buffer */
+ if (s->frame_size > buf_size) {
+ av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
+ err = AAC_AC3_PARSE_ERROR_FRAME_SIZE;
+ } else if (avctx->error_recognition >= FF_ER_CAREFUL) {
+ /* check for crc mismatch */
+ if (av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, &buf[2], s->frame_size-2)) {
+ av_log(avctx, AV_LOG_ERROR, "frame CRC mismatch\n");
+ err = AAC_AC3_PARSE_ERROR_CRC;
+ }
+ }
}
/* if frame is ok, set audio parameters */
out_samples += 256 * s->out_channels;
}
*data_size = s->num_blocks * 256 * avctx->channels * sizeof (int16_t);
- return s->frame_size;
+ return FFMIN(buf_size, s->frame_size);
}
/**
AVCodec ac3_decoder = {
.name = "ac3",
- .type = CODEC_TYPE_AUDIO,
+ .type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_AC3,
.priv_data_size = sizeof (AC3DecodeContext),
.init = ac3_decode_init,
#if CONFIG_EAC3_DECODER
AVCodec eac3_decoder = {
.name = "eac3",
- .type = CODEC_TYPE_AUDIO,
+ .type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_EAC3,
.priv_data_size = sizeof (AC3DecodeContext),
.init = ac3_decode_init,
projects / ffmpeg / blobdiff