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1 | /* | ||
2 | * MPEG-4 video frame extraction | ||
3 | * Copyright (c) 2003 Fabrice Bellard | ||
4 | * Copyright (c) 2003 Michael Niedermayer | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | #define UNCHECKED_BITSTREAM_READER 1 | ||
24 | |||
25 | #include "decode.h" | ||
26 | #include "parser.h" | ||
27 | #include "mpegvideo.h" | ||
28 | #include "mpeg4videodec.h" | ||
29 | #include "mpeg4videodefs.h" | ||
30 | |||
31 | struct Mp4vParseContext { | ||
32 | ParseContext pc; | ||
33 | Mpeg4DecContext dec_ctx; | ||
34 | int first_picture; | ||
35 | }; | ||
36 | |||
37 | /** | ||
38 | * Find the end of the current frame in the bitstream. | ||
39 | * @return the position of the first byte of the next frame, or -1 | ||
40 | */ | ||
41 | 8488 | static int mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) | |
42 | { | ||
43 | int vop_found, i; | ||
44 | uint32_t state; | ||
45 | |||
46 | 8488 | vop_found = pc->frame_start_found; | |
47 | 8488 | state = pc->state; | |
48 | |||
49 | 8488 | i = 0; | |
50 |
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8488 | if (!vop_found) { |
51 |
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8483 | for (i = 0; i < buf_size; i++) { |
52 | 8481 | state = (state << 8) | buf[i]; | |
53 |
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8481 | if (state == VOP_STARTCODE) { |
54 | 1086 | i++; | |
55 | 1086 | vop_found = 1; | |
56 | 1086 | break; | |
57 | } | ||
58 | } | ||
59 | } | ||
60 | |||
61 |
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8488 | if (vop_found) { |
62 | /* EOF considered as end of frame */ | ||
63 |
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8486 | if (buf_size == 0) |
64 | 26 | return 0; | |
65 |
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8769521 | for (; i < buf_size; i++) { |
66 | 8762134 | state = (state << 8) | buf[i]; | |
67 |
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8762134 | if ((state & 0xFFFFFF00) == 0x100) { |
68 |
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1103 | if (state == SLICE_STARTCODE || state == EXT_STARTCODE) |
69 | 30 | continue; | |
70 | 1073 | pc->frame_start_found = 0; | |
71 | 1073 | pc->state = -1; | |
72 | 1073 | return i - 3; | |
73 | } | ||
74 | } | ||
75 | } | ||
76 | 7389 | pc->frame_start_found = vop_found; | |
77 | 7389 | pc->state = state; | |
78 | 7389 | return END_NOT_FOUND; | |
79 | } | ||
80 | |||
81 | /* XXX: make it use less memory */ | ||
82 | 3578 | static int mpeg4_decode_header(AVCodecParserContext *s1, AVCodecContext *avctx, | |
83 | const uint8_t *buf, int buf_size) | ||
84 | { | ||
85 | 3578 | struct Mp4vParseContext *pc = s1->priv_data; | |
86 | 3578 | Mpeg4DecContext *dec_ctx = &pc->dec_ctx; | |
87 | 3578 | MpegEncContext *s = &dec_ctx->m; | |
88 | 3578 | GetBitContext gb1, *gb = &gb1; | |
89 | int ret; | ||
90 | |||
91 | 3578 | s->avctx = avctx; | |
92 | 3578 | s->current_picture_ptr = &s->current_picture; | |
93 | |||
94 |
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3578 | if (avctx->extradata_size && pc->first_picture) { |
95 | 241 | init_get_bits(gb, avctx->extradata, avctx->extradata_size * 8); | |
96 | 241 | ret = ff_mpeg4_decode_picture_header(dec_ctx, gb, 1, 1); | |
97 |
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241 | if (ret < 0) |
98 | ✗ | av_log(avctx, AV_LOG_WARNING, "Failed to parse extradata\n"); | |
99 | } | ||
100 | |||
101 | 3578 | init_get_bits(gb, buf, 8 * buf_size); | |
102 | 3578 | ret = ff_mpeg4_decode_picture_header(dec_ctx, gb, 0, 1); | |
103 |
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3578 | if (s->width && (!avctx->width || !avctx->height || |
104 |
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3513 | !avctx->coded_width || !avctx->coded_height)) { |
105 | 13 | ret = ff_set_dimensions(avctx, s->width, s->height); | |
106 |
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13 | if (ret < 0) |
107 | ✗ | return ret; | |
108 | } | ||
109 |
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3578 | if((s1->flags & PARSER_FLAG_USE_CODEC_TS) && s->avctx->framerate.num>0 && ret>=0){ |
110 | av_assert1(s1->pts == AV_NOPTS_VALUE); | ||
111 | av_assert1(s1->dts == AV_NOPTS_VALUE); | ||
112 | |||
113 | 874 | s1->pts = av_rescale_q(s->time, (AVRational){1, s->avctx->framerate.num}, (AVRational){1, 1200000}); | |
114 | } | ||
115 | |||
116 | 3578 | s1->pict_type = s->pict_type; | |
117 | 3578 | pc->first_picture = 0; | |
118 | 3578 | return ret; | |
119 | } | ||
120 | |||
121 | 333 | static av_cold int mpeg4video_parse_init(AVCodecParserContext *s) | |
122 | { | ||
123 | 333 | struct Mp4vParseContext *pc = s->priv_data; | |
124 | |||
125 | 333 | pc->first_picture = 1; | |
126 | 333 | pc->dec_ctx.m.quant_precision = 5; | |
127 | 333 | pc->dec_ctx.m.slice_context_count = 1; | |
128 | 333 | pc->dec_ctx.showed_packed_warning = 1; | |
129 | 333 | return 0; | |
130 | } | ||
131 | |||
132 | 10967 | static int mpeg4video_parse(AVCodecParserContext *s, | |
133 | AVCodecContext *avctx, | ||
134 | const uint8_t **poutbuf, int *poutbuf_size, | ||
135 | const uint8_t *buf, int buf_size) | ||
136 | { | ||
137 | 10967 | ParseContext *pc = s->priv_data; | |
138 | int next; | ||
139 | |||
140 |
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10967 | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
141 | 2479 | next = buf_size; | |
142 | } else { | ||
143 | 8488 | next = mpeg4_find_frame_end(pc, buf, buf_size); | |
144 | |||
145 |
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8488 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
146 | 7389 | *poutbuf = NULL; | |
147 | 7389 | *poutbuf_size = 0; | |
148 | 7389 | return buf_size; | |
149 | } | ||
150 | } | ||
151 | 3578 | mpeg4_decode_header(s, avctx, buf, buf_size); | |
152 | |||
153 | 3578 | *poutbuf = buf; | |
154 | 3578 | *poutbuf_size = buf_size; | |
155 | 3578 | return next; | |
156 | } | ||
157 | |||
158 | const AVCodecParser ff_mpeg4video_parser = { | ||
159 | .codec_ids = { AV_CODEC_ID_MPEG4 }, | ||
160 | .priv_data_size = sizeof(struct Mp4vParseContext), | ||
161 | .parser_init = mpeg4video_parse_init, | ||
162 | .parser_parse = mpeg4video_parse, | ||
163 | .parser_close = ff_parse_close, | ||
164 | }; | ||
165 |