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
31 typedef struct TAKParseContext {
37 static av_cold int tak_init(AVCodecParserContext *s)
43 static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx,
44 const uint8_t **poutbuf, int *poutbuf_size,
45 const uint8_t *buf, int buf_size)
47 TAKParseContext *t = s->priv_data;
48 ParseContext *pc = &t->pc;
49 int next = END_NOT_FOUND;
52 int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
54 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
56 init_get_bits(&gb, buf, buf_size);
57 if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127))
58 s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples
59 : t->ti.frame_samples;
61 *poutbuf_size = buf_size;
65 while (buf_size || t->index + needed <= pc->index) {
66 if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) {
67 int tmp_buf_size = FFMIN(2 * TAK_MAX_FRAME_HEADER_BYTES,
69 const uint8_t *tmp_buf = buf;
71 ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size);
72 consumed += tmp_buf_size;
74 buf_size -= tmp_buf_size;
77 for (; t->index + needed <= pc->index; t->index++)
78 if (pc->buffer[t->index] == 0xFF &&
79 pc->buffer[t->index + 1] == 0xA0) {
82 init_get_bits(&gb, pc->buffer + t->index,
83 8 * (pc->index - t->index));
84 if (!ff_tak_decode_frame_header(avctx, &gb,
85 pc->frame_start_found ? &ti
88 !ff_tak_check_crc(pc->buffer + t->index,
89 get_bits_count(&gb) / 8)) {
90 if (!pc->frame_start_found) {
91 pc->frame_start_found = 1;
92 s->duration = t->ti.last_frame_samples ?
93 t->ti.last_frame_samples :
96 pc->frame_start_found = 0;
97 next = t->index - pc->index;
106 if (consumed && !buf_size && next == END_NOT_FOUND ||
107 ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
110 return buf_size + consumed;
113 if (next != END_NOT_FOUND) {
115 pc->overread = FFMAX(0, -next);
119 *poutbuf_size = buf_size;
123 AVCodecParser ff_tak_parser = {
124 .codec_ids = { AV_CODEC_ID_TAK },
125 .priv_data_size = sizeof(TAKParseContext),
126 .parser_init = tak_init,
127 .parser_parse = tak_parse,
128 .parser_close = ff_parse_close,