lavc/vp9_superframe_bsf: avoid error messages in one line
[ffmpeg.git] / libavcodec / tak_parser.c
1 /*
2  * TAK parser
3  * Copyright (c) 2012 Michael Niedermayer
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
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 int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx,
38                      const uint8_t **poutbuf, int *poutbuf_size,
39                      const uint8_t *buf, int buf_size)
40 {
41     TAKParseContext *t = s->priv_data;
42     ParseContext *pc   = &t->pc;
43     int next           = END_NOT_FOUND;
44     GetBitContext gb;
45     int consumed = 0;
46     int needed   = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
47     int ret;
48
49     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
50         TAKStreamInfo ti;
51         if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
52             return ret;
53         if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127))
54             s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples
55                                                    : t->ti.frame_samples;
56         *poutbuf      = buf;
57         *poutbuf_size = buf_size;
58         return buf_size;
59     }
60
61     while (buf_size || t->index + needed <= pc->index) {
62         if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) {
63             int tmp_buf_size       = FFMIN(TAK_MAX_FRAME_HEADER_BYTES,
64                                            buf_size);
65             const uint8_t *tmp_buf = buf;
66
67             if (ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size) != -1)
68                 return AVERROR(ENOMEM);
69             consumed += tmp_buf_size;
70             buf      += tmp_buf_size;
71             buf_size -= tmp_buf_size;
72         }
73
74         for (; t->index + needed <= pc->index; t->index++) {
75             if (pc->buffer[ t->index     ] == 0xFF &&
76                 pc->buffer[ t->index + 1 ] == 0xA0) {
77                 TAKStreamInfo ti;
78
79                 if ((ret = init_get_bits8(&gb, pc->buffer + t->index,
80                                           pc->index - t->index)) < 0)
81                     return ret;
82                 if (!ff_tak_decode_frame_header(avctx, &gb,
83                         pc->frame_start_found ? &ti : &t->ti, 127) &&
84                     !ff_tak_check_crc(pc->buffer + t->index,
85                                       get_bits_count(&gb) / 8)) {
86                     if (!pc->frame_start_found) {
87                         pc->frame_start_found = 1;
88                         s->duration           = t->ti.last_frame_samples ?
89                                                 t->ti.last_frame_samples :
90                                                 t->ti.frame_samples;
91                         s->key_frame          = !!(t->ti.flags & TAK_FRAME_FLAG_HAS_INFO);
92                     } else {
93                         pc->frame_start_found = 0;
94                         next                  = t->index - pc->index;
95                         t->index              = 0;
96                         goto found;
97                     }
98                 }
99             }
100         }
101     }
102 found:
103
104     if (consumed && !buf_size && next == END_NOT_FOUND ||
105         ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
106         *poutbuf      = NULL;
107         *poutbuf_size = 0;
108         return buf_size + consumed;
109     }
110
111     if (next != END_NOT_FOUND) {
112         next        += consumed;
113         pc->overread = FFMAX(0, -next);
114     }
115
116     *poutbuf      = buf;
117     *poutbuf_size = buf_size;
118     return next;
119 }
120
121 AVCodecParser ff_tak_parser = {
122     .codec_ids      = { AV_CODEC_ID_TAK },
123     .priv_data_size = sizeof(TAKParseContext),
124     .parser_parse   = tak_parse,
125     .parser_close   = ff_parse_close,
126 };