3 * Copyright (c) 2012 Michael Niedermayer
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #define BITSTREAM_READER_LE
28 #include "bitstream.h"
32 typedef struct TAKParseContext {
38 static av_cold int tak_init(AVCodecParserContext *s)
44 static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx,
45 const uint8_t **poutbuf, int *poutbuf_size,
46 const uint8_t *buf, int buf_size)
48 TAKParseContext *t = s->priv_data;
49 ParseContext *pc = &t->pc;
50 int next = END_NOT_FOUND;
53 int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
55 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
57 bitstream_init(&bc, buf, buf_size);
58 if (!ff_tak_decode_frame_header(avctx, &bc, &ti, 127))
59 s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples
60 : t->ti.frame_samples;
62 *poutbuf_size = buf_size;
66 while (buf_size || t->index + needed <= pc->index) {
67 if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) {
68 int tmp_buf_size = FFMIN(2 * TAK_MAX_FRAME_HEADER_BYTES,
70 const uint8_t *tmp_buf = buf;
72 ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size);
73 consumed += tmp_buf_size;
75 buf_size -= tmp_buf_size;
78 for (; t->index + needed <= pc->index; t->index++)
79 if (pc->buffer[t->index] == 0xFF &&
80 pc->buffer[t->index + 1] == 0xA0) {
83 bitstream_init8(&bc, pc->buffer + t->index,
84 pc->index - t->index);
85 if (!ff_tak_decode_frame_header(avctx, &bc,
86 pc->frame_start_found ? &ti
89 !ff_tak_check_crc(pc->buffer + t->index,
90 bitstream_tell(&bc) / 8)) {
91 if (!pc->frame_start_found) {
92 pc->frame_start_found = 1;
93 s->duration = t->ti.last_frame_samples ?
94 t->ti.last_frame_samples :
97 pc->frame_start_found = 0;
98 next = t->index - pc->index;
107 if (consumed && !buf_size && next == END_NOT_FOUND ||
108 ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
111 return buf_size + consumed;
114 if (next != END_NOT_FOUND) {
116 pc->overread = FFMAX(0, -next);
120 *poutbuf_size = buf_size;
124 AVCodecParser ff_tak_parser = {
125 .codec_ids = { AV_CODEC_ID_TAK },
126 .priv_data_size = sizeof(TAKParseContext),
127 .parser_init = tak_init,
128 .parser_parse = tak_parse,
129 .parser_close = ff_parse_close,