get_bits: Move BITSTREAM_READER_LE definition before all relevant #includes
[ffmpeg.git] / libavcodec / tak_parser.c
1 /*
2  * TAK parser
3  * Copyright (c) 2012 Michael Niedermayer
4  *
5  * This file is part of Libav.
6  *
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.
11  *
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.
16  *
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
20  */
21
22 /**
23  * @file
24  * TAK parser
25  **/
26
27 #define BITSTREAM_READER_LE
28 #include "parser.h"
29 #include "tak.h"
30
31 typedef struct TAKParseContext {
32     ParseContext  pc;
33     TAKStreamInfo ti;
34     int           index;
35 } TAKParseContext;
36
37 static av_cold int tak_init(AVCodecParserContext *s)
38 {
39     ff_tak_init_crc();
40     return 0;
41 }
42
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)
46 {
47     TAKParseContext *t = s->priv_data;
48     ParseContext *pc   = &t->pc;
49     int next           = END_NOT_FOUND;
50     GetBitContext gb;
51     int consumed = 0;
52     int needed   = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
53
54     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
55         TAKStreamInfo ti;
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;
60         *poutbuf      = buf;
61         *poutbuf_size = buf_size;
62         return buf_size;
63     }
64
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,
68                                            buf_size);
69             const uint8_t *tmp_buf = buf;
70
71             ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size);
72             consumed += tmp_buf_size;
73             buf      += tmp_buf_size;
74             buf_size -= tmp_buf_size;
75         }
76
77         for (; t->index + needed <= pc->index; t->index++)
78             if (pc->buffer[t->index]     == 0xFF &&
79                 pc->buffer[t->index + 1] == 0xA0) {
80                 TAKStreamInfo ti;
81
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
86                                                                       : &t->ti,
87                                                 127) &&
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 :
94                                                 t->ti.frame_samples;
95                     } else {
96                         pc->frame_start_found = 0;
97                         next                  = t->index - pc->index;
98                         t->index              = 0;
99                         goto found;
100                     }
101                 }
102             }
103     }
104
105 found:
106     if (consumed && !buf_size && next == END_NOT_FOUND ||
107         ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
108         *poutbuf      = NULL;
109         *poutbuf_size = 0;
110         return buf_size + consumed;
111     }
112
113     if (next != END_NOT_FOUND) {
114         next        += consumed;
115         pc->overread = FFMAX(0, -next);
116     }
117
118     *poutbuf      = buf;
119     *poutbuf_size = buf_size;
120     return next;
121 }
122
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,
129 };