3 * Copyright (c) 2012 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 typedef struct TAKParseContext {
36 static av_cold int tak_init(AVCodecParserContext *s)
42 static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx,
43 const uint8_t **poutbuf, int *poutbuf_size,
44 const uint8_t *buf, int buf_size)
46 TAKParseContext *t = s->priv_data;
47 ParseContext *pc = &t->pc;
48 int next = END_NOT_FOUND;
51 int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
53 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
55 init_get_bits(&gb, buf, buf_size);
56 if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127))
57 s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples :
60 *poutbuf_size = buf_size;
64 while (buf_size || t->index + needed <= pc->index) {
65 if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) {
66 int tmp_buf_size = FFMIN(2 * TAK_MAX_FRAME_HEADER_BYTES, buf_size);
67 const uint8_t *tmp_buf = buf;
69 if (ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size) != -1)
70 return AVERROR(ENOMEM);
71 consumed += tmp_buf_size;
73 buf_size -= tmp_buf_size;
76 for (; t->index + needed <= pc->index; t->index++) {
77 if (pc->buffer[ t->index ] == 0xFF &&
78 pc->buffer[ t->index + 1 ] == 0xA0) {
81 init_get_bits(&gb, pc->buffer + t->index,
82 8 * (pc->index - t->index));
83 if (!ff_tak_decode_frame_header(avctx, &gb,
84 pc->frame_start_found ? &ti : &t->ti, 127) &&
85 !ff_tak_check_crc(pc->buffer + t->index,
86 get_bits_count(&gb) / 8)) {
87 if (!pc->frame_start_found) {
88 pc->frame_start_found = 1;
89 s->duration = t->ti.last_frame_samples ?
90 t->ti.last_frame_samples :
93 pc->frame_start_found = 0;
94 next = t->index - pc->index;
104 if (consumed && !buf_size && next == END_NOT_FOUND ||
105 ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
108 return buf_size + consumed;
111 if (next != END_NOT_FOUND) {
113 pc->overread = FFMAX(0, -next);
117 *poutbuf_size = buf_size;
121 AVCodecParser ff_tak_parser = {
122 .codec_ids = { AV_CODEC_ID_TAK },
123 .priv_data_size = sizeof(TAKParseContext),
124 .parser_init = tak_init,
125 .parser_parse = tak_parse,
126 .parser_close = ff_parse_close,