352 lines
11 KiB
C
Executable file
352 lines
11 KiB
C
Executable file
/*
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* DCA parser
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* Copyright (C) 2004 Gildas Bazin
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* Copyright (C) 2004 Benjamin Zores
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* Copyright (C) 2006 Benjamin Larsson
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* Copyright (C) 2007 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "dca.h"
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#include "dca_core.h"
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#include "dca_exss.h"
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#include "dca_lbr.h"
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#include "dca_syncwords.h"
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#include "get_bits.h"
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#include "parser.h"
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typedef struct DCAParseContext {
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ParseContext pc;
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uint32_t lastmarker;
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int size;
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int framesize;
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unsigned int startpos;
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DCAExssParser exss;
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unsigned int sr_code;
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} DCAParseContext;
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#define IS_CORE_MARKER(state) \
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(((state & 0xFFFFFFFFF0FF) == (((uint64_t)DCA_SYNCWORD_CORE_14B_LE << 16) | 0xF007)) || \
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((state & 0xFFFFFFFFFFF0) == (((uint64_t)DCA_SYNCWORD_CORE_14B_BE << 16) | 0x07F0)) || \
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((state & 0xFFFFFFFF00FC) == (((uint64_t)DCA_SYNCWORD_CORE_LE << 16) | 0x00FC)) || \
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((state & 0xFFFFFFFFFC00) == (((uint64_t)DCA_SYNCWORD_CORE_BE << 16) | 0xFC00)))
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#define IS_EXSS_MARKER(state) ((state & 0xFFFFFFFF) == DCA_SYNCWORD_SUBSTREAM)
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#define IS_MARKER(state) (IS_CORE_MARKER(state) || IS_EXSS_MARKER(state))
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#define CORE_MARKER(state) ((state >> 16) & 0xFFFFFFFF)
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#define EXSS_MARKER(state) (state & 0xFFFFFFFF)
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#define STATE_LE(state) (((state & 0xFF00FF00) >> 8) | ((state & 0x00FF00FF) << 8))
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#define STATE_14(state) (((state & 0x3FFF0000) >> 8) | ((state & 0x00003FFF) >> 6))
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#define CORE_FRAMESIZE(state) (((state >> 4) & 0x3FFF) + 1)
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#define EXSS_FRAMESIZE(state) ((state & 0x2000000000) ? \
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((state >> 5) & 0xFFFFF) + 1 : \
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((state >> 13) & 0x0FFFF) + 1)
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/**
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* Find the end of the current frame in the bitstream.
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* @return the position of the first byte of the next frame, or -1
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*/
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static int dca_find_frame_end(DCAParseContext *pc1, const uint8_t *buf,
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int buf_size)
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{
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int start_found, size, i;
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uint64_t state;
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ParseContext *pc = &pc1->pc;
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start_found = pc->frame_start_found;
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state = pc->state64;
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size = pc1->size;
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i = 0;
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if (!start_found) {
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for (; i < buf_size; i++) {
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size++;
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state = (state << 8) | buf[i];
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if (IS_MARKER(state) &&
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(!pc1->lastmarker ||
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pc1->lastmarker == CORE_MARKER(state) ||
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pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) {
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if (!pc1->lastmarker)
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pc1->startpos = IS_EXSS_MARKER(state) ? size - 4 : size - 6;
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if (IS_EXSS_MARKER(state))
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pc1->lastmarker = EXSS_MARKER(state);
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else
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pc1->lastmarker = CORE_MARKER(state);
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start_found = 1;
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size = 0;
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i++;
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break;
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}
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}
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}
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if (start_found) {
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for (; i < buf_size; i++) {
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size++;
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state = (state << 8) | buf[i];
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if (start_found == 1) {
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switch (pc1->lastmarker) {
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case DCA_SYNCWORD_CORE_BE:
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if (size == 2) {
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pc1->framesize = CORE_FRAMESIZE(state);
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start_found = 2;
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}
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break;
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case DCA_SYNCWORD_CORE_LE:
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if (size == 2) {
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pc1->framesize = CORE_FRAMESIZE(STATE_LE(state));
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start_found = 4;
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}
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break;
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case DCA_SYNCWORD_CORE_14B_BE:
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if (size == 4) {
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pc1->framesize = CORE_FRAMESIZE(STATE_14(state));
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start_found = 4;
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}
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break;
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case DCA_SYNCWORD_CORE_14B_LE:
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if (size == 4) {
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pc1->framesize = CORE_FRAMESIZE(STATE_14(STATE_LE(state)));
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start_found = 4;
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}
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break;
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case DCA_SYNCWORD_SUBSTREAM:
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if (size == 6) {
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pc1->framesize = EXSS_FRAMESIZE(state);
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start_found = 4;
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}
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break;
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default:
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av_assert0(0);
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}
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continue;
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}
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if (start_found == 2 && IS_EXSS_MARKER(state) &&
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pc1->framesize <= size + 2) {
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pc1->framesize = size + 2;
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start_found = 3;
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continue;
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}
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if (start_found == 3) {
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if (size == pc1->framesize + 4) {
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pc1->framesize += EXSS_FRAMESIZE(state);
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start_found = 4;
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}
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continue;
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}
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if (pc1->framesize > size)
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continue;
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if (IS_MARKER(state) &&
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(pc1->lastmarker == CORE_MARKER(state) ||
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pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) {
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pc->frame_start_found = 0;
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pc->state64 = -1;
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pc1->size = 0;
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return IS_EXSS_MARKER(state) ? i - 3 : i - 5;
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}
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}
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}
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pc->frame_start_found = start_found;
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pc->state64 = state;
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pc1->size = size;
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return END_NOT_FOUND;
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}
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static av_cold int dca_parse_init(AVCodecParserContext *s)
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{
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DCAParseContext *pc1 = s->priv_data;
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pc1->lastmarker = 0;
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pc1->sr_code = -1;
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return 0;
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}
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static int dca_parse_params(DCAParseContext *pc1, const uint8_t *buf,
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int buf_size, int *duration, int *sample_rate,
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int *profile)
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{
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DCAExssAsset *asset = &pc1->exss.assets[0];
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GetBitContext gb;
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DCACoreFrameHeader h;
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uint8_t hdr[DCA_CORE_FRAME_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
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int ret, frame_size;
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if (buf_size < DCA_CORE_FRAME_HEADER_SIZE)
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return AVERROR_INVALIDDATA;
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if (AV_RB32(buf) == DCA_SYNCWORD_SUBSTREAM) {
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if ((ret = ff_dca_exss_parse(&pc1->exss, buf, buf_size)) < 0)
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return ret;
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if (asset->extension_mask & DCA_EXSS_LBR) {
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if ((ret = init_get_bits8(&gb, buf + asset->lbr_offset, asset->lbr_size)) < 0)
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return ret;
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if (get_bits_long(&gb, 32) != DCA_SYNCWORD_LBR)
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return AVERROR_INVALIDDATA;
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switch (get_bits(&gb, 8)) {
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case DCA_LBR_HEADER_DECODER_INIT:
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pc1->sr_code = get_bits(&gb, 8);
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case DCA_LBR_HEADER_SYNC_ONLY:
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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if (pc1->sr_code >= FF_ARRAY_ELEMS(ff_dca_sampling_freqs))
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return AVERROR_INVALIDDATA;
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*sample_rate = ff_dca_sampling_freqs[pc1->sr_code];
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*duration = 1024 << ff_dca_freq_ranges[pc1->sr_code];
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*profile = FF_PROFILE_DTS_EXPRESS;
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return 0;
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}
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if (asset->extension_mask & DCA_EXSS_XLL) {
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int nsamples_log2;
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if ((ret = init_get_bits8(&gb, buf + asset->xll_offset, asset->xll_size)) < 0)
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return ret;
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if (get_bits_long(&gb, 32) != DCA_SYNCWORD_XLL)
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return AVERROR_INVALIDDATA;
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if (get_bits(&gb, 4))
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return AVERROR_INVALIDDATA;
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skip_bits(&gb, 8);
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skip_bits_long(&gb, get_bits(&gb, 5) + 1);
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skip_bits(&gb, 4);
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nsamples_log2 = get_bits(&gb, 4) + get_bits(&gb, 4);
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if (nsamples_log2 > 24)
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return AVERROR_INVALIDDATA;
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*sample_rate = asset->max_sample_rate;
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*duration = (1 + (*sample_rate > 96000)) << nsamples_log2;
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*profile = FF_PROFILE_DTS_HD_MA;
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return 0;
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}
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return AVERROR_INVALIDDATA;
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}
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if ((ret = avpriv_dca_convert_bitstream(buf, DCA_CORE_FRAME_HEADER_SIZE,
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hdr, DCA_CORE_FRAME_HEADER_SIZE)) < 0)
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return ret;
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if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
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return AVERROR_INVALIDDATA;
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*duration = h.npcmblocks * DCA_PCMBLOCK_SAMPLES;
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*sample_rate = avpriv_dca_sample_rates[h.sr_code];
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if (*profile != FF_PROFILE_UNKNOWN)
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return 0;
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*profile = FF_PROFILE_DTS;
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if (h.ext_audio_present) {
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switch (h.ext_audio_type) {
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case DCA_EXT_AUDIO_XCH:
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case DCA_EXT_AUDIO_XXCH:
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*profile = FF_PROFILE_DTS_ES;
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break;
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case DCA_EXT_AUDIO_X96:
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*profile = FF_PROFILE_DTS_96_24;
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break;
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}
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}
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frame_size = FFALIGN(h.frame_size, 4);
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if (buf_size - 4 < frame_size)
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return 0;
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buf += frame_size;
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buf_size -= frame_size;
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if (AV_RB32(buf) != DCA_SYNCWORD_SUBSTREAM)
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return 0;
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if (ff_dca_exss_parse(&pc1->exss, buf, buf_size) < 0)
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return 0;
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if (asset->extension_mask & DCA_EXSS_XLL)
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*profile = FF_PROFILE_DTS_HD_MA;
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else if (asset->extension_mask & (DCA_EXSS_XBR | DCA_EXSS_XXCH | DCA_EXSS_X96))
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*profile = FF_PROFILE_DTS_HD_HRA;
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return 0;
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}
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static int dca_parse(AVCodecParserContext *s, AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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DCAParseContext *pc1 = s->priv_data;
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ParseContext *pc = &pc1->pc;
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int next, duration, sample_rate;
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if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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next = buf_size;
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} else {
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next = dca_find_frame_end(pc1, buf, buf_size);
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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/* skip initial padding */
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if (buf_size > pc1->startpos) {
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buf += pc1->startpos;
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buf_size -= pc1->startpos;
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}
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pc1->startpos = 0;
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}
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/* read the duration and sample rate from the frame header */
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if (!dca_parse_params(pc1, buf, buf_size, &duration, &sample_rate, &avctx->profile)) {
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if (!avctx->sample_rate)
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avctx->sample_rate = sample_rate;
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s->duration = av_rescale(duration, avctx->sample_rate, sample_rate);
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} else
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s->duration = 0;
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return next;
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}
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AVCodecParser ff_dca_parser = {
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.codec_ids = { AV_CODEC_ID_DTS },
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.priv_data_size = sizeof(DCAParseContext),
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.parser_init = dca_parse_init,
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.parser_parse = dca_parse,
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.parser_close = ff_parse_close,
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};
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