diff options
Diffstat (limited to 'libavcodec/dca.c')
| -rw-r--r-- | libavcodec/dca.c | 103 |
1 files changed, 98 insertions, 5 deletions
diff --git a/libavcodec/dca.c b/libavcodec/dca.c index c5daf077a9..a0729e61ab 100644 --- a/libavcodec/dca.c +++ b/libavcodec/dca.c @@ -1,20 +1,24 @@ /* * DCA compatible decoder data + * Copyright (C) 2004 Gildas Bazin + * Copyright (C) 2004 Benjamin Zores + * Copyright (C) 2006 Benjamin Larsson + * Copyright (C) 2007 Konstantin Shishkov * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -24,7 +28,9 @@ #include "libavutil/error.h" #include "dca.h" +#include "dca_core.h" #include "dca_syncwords.h" +#include "get_bits.h" #include "put_bits.h" const uint32_t avpriv_dca_sample_rates[16] = { @@ -32,7 +38,20 @@ const uint32_t avpriv_dca_sample_rates[16] = { 12000, 24000, 48000, 96000, 192000 }; -int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, +const uint32_t ff_dca_sampling_freqs[16] = { + 8000, 16000, 32000, 64000, 128000, 22050, 44100, 88200, + 176400, 352800, 12000, 24000, 48000, 96000, 192000, 384000, +}; + +const uint8_t ff_dca_freq_ranges[16] = { + 0, 1, 2, 3, 4, 1, 2, 3, 4, 4, 0, 1, 2, 3, 4, 4 +}; + +const uint8_t ff_dca_bits_per_sample[8] = { + 16, 16, 20, 20, 0, 24, 24, 0 +}; + +int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, int max_size) { uint32_t mrk; @@ -45,6 +64,7 @@ int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, mrk = AV_RB32(src); switch (mrk) { case DCA_SYNCWORD_CORE_BE: + case DCA_SYNCWORD_SUBSTREAM: memcpy(dst, src, src_size); return src_size; case DCA_SYNCWORD_CORE_LE: @@ -67,3 +87,76 @@ int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst, return AVERROR_INVALIDDATA; } } + +int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb) +{ + if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE) + return DCA_PARSE_ERROR_SYNC_WORD; + + h->normal_frame = get_bits1(gb); + h->deficit_samples = get_bits(gb, 5) + 1; + if (h->deficit_samples != DCA_PCMBLOCK_SAMPLES) + return DCA_PARSE_ERROR_DEFICIT_SAMPLES; + + h->crc_present = get_bits1(gb); + h->npcmblocks = get_bits(gb, 7) + 1; + if (h->npcmblocks & (DCA_SUBBAND_SAMPLES - 1)) + return DCA_PARSE_ERROR_PCM_BLOCKS; + + h->frame_size = get_bits(gb, 14) + 1; + if (h->frame_size < 96) + return DCA_PARSE_ERROR_FRAME_SIZE; + + h->audio_mode = get_bits(gb, 6); + if (h->audio_mode >= DCA_AMODE_COUNT) + return DCA_PARSE_ERROR_AMODE; + + h->sr_code = get_bits(gb, 4); + if (!avpriv_dca_sample_rates[h->sr_code]) + return DCA_PARSE_ERROR_SAMPLE_RATE; + + h->br_code = get_bits(gb, 5); + if (get_bits1(gb)) + return DCA_PARSE_ERROR_RESERVED_BIT; + + h->drc_present = get_bits1(gb); + h->ts_present = get_bits1(gb); + h->aux_present = get_bits1(gb); + h->hdcd_master = get_bits1(gb); + h->ext_audio_type = get_bits(gb, 3); + h->ext_audio_present = get_bits1(gb); + h->sync_ssf = get_bits1(gb); + h->lfe_present = get_bits(gb, 2); + if (h->lfe_present == DCA_LFE_FLAG_INVALID) + return DCA_PARSE_ERROR_LFE_FLAG; + + h->predictor_history = get_bits1(gb); + if (h->crc_present) + skip_bits(gb, 16); + h->filter_perfect = get_bits1(gb); + h->encoder_rev = get_bits(gb, 4); + h->copy_hist = get_bits(gb, 2); + h->pcmr_code = get_bits(gb, 3); + if (!ff_dca_bits_per_sample[h->pcmr_code]) + return DCA_PARSE_ERROR_PCM_RES; + + h->sumdiff_front = get_bits1(gb); + h->sumdiff_surround = get_bits1(gb); + h->dn_code = get_bits(gb, 4); + return 0; +} + +int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size) +{ + GetBitContext gb; + int ret; + + ret = init_get_bits8(&gb, buf, size); + if (ret < 0) + return ret; + + if (ff_dca_parse_core_frame_header(h, &gb) < 0) + return AVERROR_INVALIDDATA; + + return 0; +} |