diff options
author | Paul B Mahol <onemda@gmail.com> | 2018-03-26 14:47:29 +0300 |
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committer | Paul B Mahol <onemda@gmail.com> | 2018-03-29 11:19:03 +0300 |
commit | ae9297097696f3d06417a6e8a5368d5f38a6edb4 (patch) | |
tree | 731784efc2e0054d885c4c1f54efe81b930a74f4 /libavcodec/ac3dec.c | |
parent | e5819fa62930966e6fb905cef21c985b91631d87 (diff) |
avcodec/eac3: add support for dependent stream
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavcodec/ac3dec.c')
-rw-r--r-- | libavcodec/ac3dec.c | 179 |
1 files changed, 145 insertions, 34 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 244a18323f..ac5c6d636a 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -106,6 +106,25 @@ static const uint8_t ac3_default_coeffs[8][5][2] = { { { 2, 7 }, { 5, 5 }, { 7, 2 }, { 6, 7 }, { 7, 6 }, }, }; +static const uint64_t custom_channel_map_locations[16][2] = { + { 1, AV_CH_FRONT_LEFT }, + { 1, AV_CH_FRONT_CENTER }, + { 1, AV_CH_FRONT_RIGHT }, + { 1, AV_CH_SIDE_LEFT }, + { 1, AV_CH_SIDE_RIGHT }, + { 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER }, + { 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT }, + { 0, AV_CH_BACK_CENTER }, + { 0, AV_CH_TOP_CENTER }, + { 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT }, + { 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT }, + { 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT}, + { 0, AV_CH_TOP_FRONT_CENTER }, + { 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT }, + { 0, AV_CH_LOW_FREQUENCY_2 }, + { 1, AV_CH_LOW_FREQUENCY }, +}; + /** * Symmetrical Dequantization * reference: Section 7.3.3 Expansion of Mantissas for Symmetrical Quantization @@ -317,6 +336,7 @@ static int parse_frame_header(AC3DecodeContext *s) s->fbw_channels = s->channels - s->lfe_on; s->lfe_ch = s->fbw_channels + 1; s->frame_size = hdr.frame_size; + s->superframe_size += hdr.frame_size; s->preferred_downmix = AC3_DMIXMOD_NOTINDICATED; s->center_mix_level = hdr.center_mix_level; s->center_mix_level_ltrt = 4; // -3.0dB @@ -683,7 +703,7 @@ static void do_rematrixing(AC3DecodeContext *s) * Convert frequency domain coefficients to time-domain audio samples. * reference: Section 7.9.4 Transformation Equations */ -static inline void do_imdct(AC3DecodeContext *s, int channels) +static inline void do_imdct(AC3DecodeContext *s, int channels, int offset) { int ch; @@ -695,25 +715,25 @@ static inline void do_imdct(AC3DecodeContext *s, int channels) x[i] = s->transform_coeffs[ch][2 * i]; s->imdct_256.imdct_half(&s->imdct_256, s->tmp_output, x); #if USE_FIXED - s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1], + s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1 + offset], s->tmp_output, s->window, 128, 8); #else - s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1], + s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1 + offset], s->tmp_output, s->window, 128); #endif for (i = 0; i < 128; i++) x[i] = s->transform_coeffs[ch][2 * i + 1]; - s->imdct_256.imdct_half(&s->imdct_256, s->delay[ch - 1], x); + s->imdct_256.imdct_half(&s->imdct_256, s->delay[ch - 1 + offset], x); } else { s->imdct_512.imdct_half(&s->imdct_512, s->tmp_output, s->transform_coeffs[ch]); #if USE_FIXED - s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1], + s->fdsp->vector_fmul_window_scaled(s->outptr[ch - 1], s->delay[ch - 1 + offset], s->tmp_output, s->window, 128, 8); #else - s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1], + s->fdsp->vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1 + offset], s->tmp_output, s->window, 128); #endif - memcpy(s->delay[ch - 1], s->tmp_output + 128, 128 * sizeof(FFTSample)); + memcpy(s->delay[ch - 1 + offset], s->tmp_output + 128, 128 * sizeof(FFTSample)); } } } @@ -1063,7 +1083,7 @@ static inline int coupling_coordinates(AC3DecodeContext *s, int blk) /** * Decode a single audio block from the AC-3 bitstream. */ -static int decode_audio_block(AC3DecodeContext *s, int blk) +static int decode_audio_block(AC3DecodeContext *s, int blk, int offset) { int fbw_channels = s->fbw_channels; int channel_mode = s->channel_mode; @@ -1426,7 +1446,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) ac3_upmix_delay(s); } - do_imdct(s, s->channels); + do_imdct(s, s->channels, offset); if (downmix_output) { #if USE_FIXED @@ -1449,7 +1469,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) s->out_channels, s->fbw_channels, 128); } - do_imdct(s, s->out_channels); + do_imdct(s, s->out_channels, offset); } return 0; @@ -1463,14 +1483,19 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, { AVFrame *frame = data; const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; + int buf_size, full_buf_size = avpkt->size; AC3DecodeContext *s = avctx->priv_data; - int blk, ch, err, ret; + int blk, ch, err, offset, ret; + int got_independent_frame = 0; const uint8_t *channel_map; + uint8_t extended_channel_map[AC3_MAX_CHANNELS * 2]; const SHORTFLOAT *output[AC3_MAX_CHANNELS]; enum AVMatrixEncoding matrix_encoding; AVDownmixInfo *downmix_info; + s->superframe_size = 0; + + buf_size = full_buf_size; /* copy input buffer to decoder context to avoid reading past the end of the buffer, which can be caused by a damaged input stream. */ if (buf_size >= 2 && AV_RB16(buf) == 0x770B) { @@ -1488,6 +1513,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, av_lfg_init_from_data(&s->dith_state, s->input_buffer, FFMIN(buf_size, AC3_FRAME_BUFFER_SIZE)); buf = s->input_buffer; +dependent_frame: /* initialize the GetBitContext with the start of valid AC-3 Frame */ if ((ret = init_get_bits8(&s->gbc, buf, buf_size)) < 0) return ret; @@ -1511,11 +1537,11 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, break; case AAC_AC3_PARSE_ERROR_FRAME_TYPE: /* skip frame if CRC is ok. otherwise use error concealment. */ - /* TODO: add support for substreams and dependent frames */ - if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT || s->substreamid) { + /* TODO: add support for substreams */ + if (s->substreamid) { av_log(avctx, AV_LOG_DEBUG, - "unsupported frame type %d: skipping frame\n", - s->frame_type); + "unsupported substream %d: skipping frame\n", + s->substreamid); *got_frame_ptr = 0; return buf_size; } else { @@ -1546,10 +1572,10 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, } } - /* if frame is ok, set audio parameters */ - if (!err) { - avctx->sample_rate = s->sample_rate; - avctx->bit_rate = s->bit_rate; + if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT && !got_independent_frame) { + av_log(avctx, AV_LOG_WARNING, "Ignoring dependent frame without independent frame.\n"); + *got_frame_ptr = 0; + return FFMIN(full_buf_size, s->frame_size); } /* channel config */ @@ -1594,29 +1620,25 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, if (s->bitstream_mode == 0x7 && s->channels > 1) avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE; - /* get output buffer */ - frame->nb_samples = s->num_blocks * AC3_BLOCK_SIZE; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - /* decode the audio blocks */ channel_map = ff_ac3_dec_channel_map[s->output_mode & ~AC3_OUTPUT_LFEON][s->lfe_on]; + offset = s->frame_type == EAC3_FRAME_TYPE_DEPENDENT ? AC3_MAX_CHANNELS : 0; for (ch = 0; ch < AC3_MAX_CHANNELS; ch++) { - output[ch] = s->output[ch]; - s->outptr[ch] = s->output[ch]; + output[ch] = s->output[ch + offset]; + s->outptr[ch] = s->output[ch + offset]; } for (ch = 0; ch < s->channels; ch++) { if (ch < s->out_channels) - s->outptr[channel_map[ch]] = (SHORTFLOAT *)frame->data[ch]; + s->outptr[channel_map[ch]] = s->output_buffer[ch + offset]; } for (blk = 0; blk < s->num_blocks; blk++) { - if (!err && decode_audio_block(s, blk)) { + if (!err && decode_audio_block(s, blk, offset)) { av_log(avctx, AV_LOG_ERROR, "error decoding the audio block\n"); err = 1; } if (err) for (ch = 0; ch < s->out_channels; ch++) - memcpy(((SHORTFLOAT*)frame->data[ch]) + AC3_BLOCK_SIZE*blk, output[ch], AC3_BLOCK_SIZE*sizeof(SHORTFLOAT)); + memcpy(s->output_buffer[ch + offset] + AC3_BLOCK_SIZE*blk, output[ch], AC3_BLOCK_SIZE*sizeof(SHORTFLOAT)); for (ch = 0; ch < s->out_channels; ch++) output[ch] = s->outptr[channel_map[ch]]; for (ch = 0; ch < s->out_channels; ch++) { @@ -1625,11 +1647,100 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, } } - frame->decode_error_flags = err ? FF_DECODE_ERROR_INVALID_BITSTREAM : 0; - /* keep last block for error concealment in next frame */ for (ch = 0; ch < s->out_channels; ch++) - memcpy(s->output[ch], output[ch], AC3_BLOCK_SIZE*sizeof(SHORTFLOAT)); + memcpy(s->output[ch + offset], output[ch], AC3_BLOCK_SIZE*sizeof(SHORTFLOAT)); + + /* check if there is dependent frame */ + if (buf_size > s->frame_size) { + AC3HeaderInfo hdr; + int err; + + if ((ret = init_get_bits8(&s->gbc, buf + s->frame_size, buf_size - s->frame_size)) < 0) + return ret; + + err = ff_ac3_parse_header(&s->gbc, &hdr); + if (err) + return err; + + if (hdr.frame_type == EAC3_FRAME_TYPE_DEPENDENT) { + if (hdr.num_blocks != s->num_blocks || s->sample_rate != hdr.sample_rate) { + av_log(avctx, AV_LOG_WARNING, "Ignoring non-compatible dependent frame.\n"); + } else { + buf += s->frame_size; + buf_size -= s->frame_size; + s->prev_output_mode = s->output_mode; + s->prev_bit_rate = s->bit_rate; + got_independent_frame = 1; + goto dependent_frame; + } + } + } + + frame->decode_error_flags = err ? FF_DECODE_ERROR_INVALID_BITSTREAM : 0; + + /* if frame is ok, set audio parameters */ + if (!err) { + avctx->sample_rate = s->sample_rate; + avctx->bit_rate = s->bit_rate + s->prev_bit_rate; + } + + for (ch = 0; ch < 16; ch++) + extended_channel_map[ch] = ch; + + if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT) { + uint64_t ich_layout = avpriv_ac3_channel_layout_tab[s->prev_output_mode & ~AC3_OUTPUT_LFEON]; + uint64_t channel_layout; + int extend = 0; + + if (s->prev_output_mode & AC3_OUTPUT_LFEON) + ich_layout |= AV_CH_LOW_FREQUENCY; + + channel_layout = ich_layout; + for (ch = 0; ch < 16; ch++) { + if (s->channel_map & (1 << (15 - ch))) { + channel_layout |= custom_channel_map_locations[ch][1]; + } + } + + avctx->channel_layout = channel_layout; + avctx->channels = av_get_channel_layout_nb_channels(channel_layout); + + for (ch = 0; ch < 16; ch++) { + if (s->channel_map & (1 << (15 - ch))) { + if (custom_channel_map_locations[ch][0]) { + int index = av_get_channel_layout_channel_index(channel_layout, + custom_channel_map_locations[ch][1]); + if (index < 0) + return AVERROR_INVALIDDATA; + extended_channel_map[index] = offset + channel_map[extend++]; + } else { + int i; + + for (i = 0; i < 64; i++) { + if ((1LL << i) & custom_channel_map_locations[ch][1]) { + int index = av_get_channel_layout_channel_index(channel_layout, + 1LL << i); + if (index < 0) + return AVERROR_INVALIDDATA; + extended_channel_map[index] = offset + channel_map[extend++]; + } + } + } + } + } + } + + /* get output buffer */ + frame->nb_samples = s->num_blocks * AC3_BLOCK_SIZE; + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + for (ch = 0; ch < avctx->channels; ch++) { + int map = extended_channel_map[ch]; + memcpy((SHORTFLOAT *)frame->data[ch], s->output_buffer[map], + s->num_blocks * AC3_BLOCK_SIZE * sizeof(SHORTFLOAT)); + } /* * AVMatrixEncoding @@ -1689,7 +1800,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, *got_frame_ptr = 1; - return FFMIN(buf_size, s->frame_size); + return FFMIN(full_buf_size, s->superframe_size); } /** |