diff options
Diffstat (limited to 'libavcodec/dca_parser.c')
| -rw-r--r-- | libavcodec/dca_parser.c | 254 |
1 files changed, 211 insertions, 43 deletions
diff --git a/libavcodec/dca_parser.c b/libavcodec/dca_parser.c index c33cc9a..80d6659 100644 --- a/libavcodec/dca_parser.c +++ b/libavcodec/dca_parser.c @@ -5,24 +5,27 @@ * 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 */ #include "dca.h" +#include "dca_core.h" +#include "dca_exss.h" +#include "dca_lbr.h" #include "dca_syncwords.h" #include "get_bits.h" #include "parser.h" @@ -32,6 +35,9 @@ typedef struct DCAParseContext { uint32_t lastmarker; int size; int framesize; + unsigned int startpos; + DCAExssParser exss; + unsigned int sr_code; } DCAParseContext; #define IS_CORE_MARKER(state) \ @@ -47,6 +53,14 @@ typedef struct DCAParseContext { #define CORE_MARKER(state) ((state >> 16) & 0xFFFFFFFF) #define EXSS_MARKER(state) (state & 0xFFFFFFFF) +#define STATE_LE(state) (((state & 0xFF00FF00) >> 8) | ((state & 0x00FF00FF) << 8)) +#define STATE_14(state) (((state & 0x3FFF0000) >> 8) | ((state & 0x00003FFF) >> 6)) + +#define CORE_FRAMESIZE(state) (((state >> 4) & 0x3FFF) + 1) +#define EXSS_FRAMESIZE(state) ((state & 0x2000000000) ? \ + ((state >> 5) & 0xFFFFF) + 1 : \ + ((state >> 13) & 0x0FFFF) + 1) + /** * Find the end of the current frame in the bitstream. * @return the position of the first byte of the next frame, or -1 @@ -54,41 +68,105 @@ typedef struct DCAParseContext { static int dca_find_frame_end(DCAParseContext *pc1, const uint8_t *buf, int buf_size) { - int start_found, i; + int start_found, size, i; uint64_t state; ParseContext *pc = &pc1->pc; start_found = pc->frame_start_found; state = pc->state64; + size = pc1->size; i = 0; if (!start_found) { - for (i = 0; i < buf_size; i++) { + for (; i < buf_size; i++) { + size++; state = (state << 8) | buf[i]; - if (IS_MARKER(state)) { - if (!pc1->lastmarker || - pc1->lastmarker == CORE_MARKER(state) || - pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM) { - start_found = 1; - if (IS_EXSS_MARKER(state)) - pc1->lastmarker = EXSS_MARKER(state); - else - pc1->lastmarker = CORE_MARKER(state); - i++; - break; - } + + if (IS_MARKER(state) && + (!pc1->lastmarker || + pc1->lastmarker == CORE_MARKER(state) || + pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) { + if (!pc1->lastmarker) + pc1->startpos = IS_EXSS_MARKER(state) ? size - 4 : size - 6; + + if (IS_EXSS_MARKER(state)) + pc1->lastmarker = EXSS_MARKER(state); + else + pc1->lastmarker = CORE_MARKER(state); + + start_found = 1; + size = 0; + + i++; + break; } } } + if (start_found) { for (; i < buf_size; i++) { - pc1->size++; + size++; state = (state << 8) | buf[i]; + + if (start_found == 1) { + switch (pc1->lastmarker) { + case DCA_SYNCWORD_CORE_BE: + if (size == 2) { + pc1->framesize = CORE_FRAMESIZE(state); + start_found = 2; + } + break; + case DCA_SYNCWORD_CORE_LE: + if (size == 2) { + pc1->framesize = CORE_FRAMESIZE(STATE_LE(state)); + start_found = 4; + } + break; + case DCA_SYNCWORD_CORE_14B_BE: + if (size == 4) { + pc1->framesize = CORE_FRAMESIZE(STATE_14(state)); + start_found = 4; + } + break; + case DCA_SYNCWORD_CORE_14B_LE: + if (size == 4) { + pc1->framesize = CORE_FRAMESIZE(STATE_14(STATE_LE(state))); + start_found = 4; + } + break; + case DCA_SYNCWORD_SUBSTREAM: + if (size == 6) { + pc1->framesize = EXSS_FRAMESIZE(state); + start_found = 4; + } + break; + default: + av_assert0(0); + } + continue; + } + + if (start_found == 2 && IS_EXSS_MARKER(state) && + pc1->framesize <= size + 2) { + pc1->framesize = size + 2; + start_found = 3; + continue; + } + + if (start_found == 3) { + if (size == pc1->framesize + 4) { + pc1->framesize += EXSS_FRAMESIZE(state); + start_found = 4; + } + continue; + } + + if (pc1->framesize > size) + continue; + if (IS_MARKER(state) && (pc1->lastmarker == CORE_MARKER(state) || pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) { - if (pc1->framesize > pc1->size) - continue; pc->frame_start_found = 0; pc->state64 = -1; pc1->size = 0; @@ -96,8 +174,10 @@ static int dca_find_frame_end(DCAParseContext *pc1, const uint8_t *buf, } } } + pc->frame_start_found = start_found; pc->state64 = state; + pc1->size = size; return END_NOT_FOUND; } @@ -106,40 +186,120 @@ static av_cold int dca_parse_init(AVCodecParserContext *s) DCAParseContext *pc1 = s->priv_data; pc1->lastmarker = 0; + pc1->sr_code = -1; return 0; } -static int dca_parse_params(const uint8_t *buf, int buf_size, int *duration, - int *sample_rate, int *framesize) +static int dca_parse_params(DCAParseContext *pc1, const uint8_t *buf, + int buf_size, int *duration, int *sample_rate, + int *profile) { + DCAExssAsset *asset = &pc1->exss.assets[0]; GetBitContext gb; - uint8_t hdr[12 + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 }; - int ret, sample_blocks, sr_code; + DCACoreFrameHeader h; + uint8_t hdr[DCA_CORE_FRAME_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 }; + int ret, frame_size; - if (buf_size < 12) + if (buf_size < DCA_CORE_FRAME_HEADER_SIZE) return AVERROR_INVALIDDATA; - if ((ret = ff_dca_convert_bitstream(buf, 12, hdr, 12)) < 0) - return ret; + if (AV_RB32(buf) == DCA_SYNCWORD_SUBSTREAM) { + if ((ret = ff_dca_exss_parse(&pc1->exss, buf, buf_size)) < 0) + return ret; - init_get_bits(&gb, hdr, 96); + if (asset->extension_mask & DCA_EXSS_LBR) { + if ((ret = init_get_bits8(&gb, buf + asset->lbr_offset, asset->lbr_size)) < 0) + return ret; - skip_bits_long(&gb, 39); - sample_blocks = get_bits(&gb, 7) + 1; - if (sample_blocks < 8) - return AVERROR_INVALIDDATA; - *duration = 256 * (sample_blocks / 8); + if (get_bits_long(&gb, 32) != DCA_SYNCWORD_LBR) + return AVERROR_INVALIDDATA; + + switch (get_bits(&gb, 8)) { + case DCA_LBR_HEADER_DECODER_INIT: + pc1->sr_code = get_bits(&gb, 8); + case DCA_LBR_HEADER_SYNC_ONLY: + break; + default: + return AVERROR_INVALIDDATA; + } + + if (pc1->sr_code >= FF_ARRAY_ELEMS(ff_dca_sampling_freqs)) + return AVERROR_INVALIDDATA; + + *sample_rate = ff_dca_sampling_freqs[pc1->sr_code]; + *duration = 1024 << ff_dca_freq_ranges[pc1->sr_code]; + *profile = FF_PROFILE_DTS_EXPRESS; + return 0; + } + + if (asset->extension_mask & DCA_EXSS_XLL) { + int nsamples_log2; + + if ((ret = init_get_bits8(&gb, buf + asset->xll_offset, asset->xll_size)) < 0) + return ret; + + if (get_bits_long(&gb, 32) != DCA_SYNCWORD_XLL) + return AVERROR_INVALIDDATA; + + if (get_bits(&gb, 4)) + return AVERROR_INVALIDDATA; + + skip_bits(&gb, 8); + skip_bits_long(&gb, get_bits(&gb, 5) + 1); + skip_bits(&gb, 4); + nsamples_log2 = get_bits(&gb, 4) + get_bits(&gb, 4); + if (nsamples_log2 > 24) + return AVERROR_INVALIDDATA; + + *sample_rate = asset->max_sample_rate; + *duration = (1 + (*sample_rate > 96000)) << nsamples_log2; + *profile = FF_PROFILE_DTS_HD_MA; + return 0; + } - *framesize = get_bits(&gb, 14) + 1; - if (*framesize < 95) return AVERROR_INVALIDDATA; + } - skip_bits(&gb, 6); - sr_code = get_bits(&gb, 4); - *sample_rate = avpriv_dca_sample_rates[sr_code]; - if (*sample_rate == 0) + if ((ret = avpriv_dca_convert_bitstream(buf, DCA_CORE_FRAME_HEADER_SIZE, + hdr, DCA_CORE_FRAME_HEADER_SIZE)) < 0) + return ret; + if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0) return AVERROR_INVALIDDATA; + *duration = h.npcmblocks * DCA_PCMBLOCK_SAMPLES; + *sample_rate = avpriv_dca_sample_rates[h.sr_code]; + if (*profile != FF_PROFILE_UNKNOWN) + return 0; + + *profile = FF_PROFILE_DTS; + if (h.ext_audio_present) { + switch (h.ext_audio_type) { + case DCA_EXT_AUDIO_XCH: + case DCA_EXT_AUDIO_XXCH: + *profile = FF_PROFILE_DTS_ES; + break; + case DCA_EXT_AUDIO_X96: + *profile = FF_PROFILE_DTS_96_24; + break; + } + } + + frame_size = FFALIGN(h.frame_size, 4); + if (buf_size - 4 < frame_size) + return 0; + + buf += frame_size; + buf_size -= frame_size; + if (AV_RB32(buf) != DCA_SYNCWORD_SUBSTREAM) + return 0; + if (ff_dca_exss_parse(&pc1->exss, buf, buf_size) < 0) + return 0; + + if (asset->extension_mask & DCA_EXSS_XLL) + *profile = FF_PROFILE_DTS_HD_MA; + else if (asset->extension_mask & (DCA_EXSS_XBR | DCA_EXSS_XXCH | DCA_EXSS_X96)) + *profile = FF_PROFILE_DTS_HD_HRA; + return 0; } @@ -161,12 +321,20 @@ static int dca_parse(AVCodecParserContext *s, AVCodecContext *avctx, *poutbuf_size = 0; return buf_size; } + + /* skip initial padding */ + if (buf_size > pc1->startpos) { + buf += pc1->startpos; + buf_size -= pc1->startpos; + } + pc1->startpos = 0; } /* read the duration and sample rate from the frame header */ - if (!dca_parse_params(buf, buf_size, &duration, &sample_rate, &pc1->framesize)) { - s->duration = duration; - avctx->sample_rate = sample_rate; + if (!dca_parse_params(pc1, buf, buf_size, &duration, &sample_rate, &avctx->profile)) { + if (!avctx->sample_rate) + avctx->sample_rate = sample_rate; + s->duration = av_rescale(duration, avctx->sample_rate, sample_rate); } else s->duration = 0; |
