Fix vf_tcdump's compilation
[mplayer/kovensky.git] / libmpdemux / parse_mp4.c
blob137ec3e6e7ef0cdfbebc29ec93e56980a3c6a49c
1 /*
2 * MP4 file format parser code
4 * Copyright (C) 2002 Felix Buenemann <atmosfear at users.sourceforge.net>
5 * Code inspired by libmp4 from http://mpeg4ip.sourceforge.net/.
7 * This file is part of MPlayer.
9 * MPlayer is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * MPlayer is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include <stdio.h>
25 #include <inttypes.h>
26 #include <stdlib.h>
27 #include "parse_mp4.h"
28 #include "mp_msg.h"
29 #include "stream/stream.h"
31 //#define MP4_DUMPATOM
33 #define MP4_DL MSGL_V
34 #define freereturn(a,b) free(a); return b
36 static int mp4_read_descr_len(stream_t *s)
38 uint8_t b;
39 uint8_t numBytes = 0;
40 uint32_t length = 0;
42 do {
43 b = stream_read_char(s);
44 numBytes++;
45 length = (length << 7) | (b & 0x7F);
46 } while ((b & 0x80) && numBytes < 4);
48 //printf("MP4 read desc len: %d\n", length);
49 return length;
52 /* parse the data part of MP4 esds atoms */
53 int mp4_parse_esds(unsigned char *data, int datalen, esds_t *esds) {
54 /* create memory stream from data */
55 stream_t *s = new_memory_stream(data, datalen);
56 uint16_t len;
57 #ifdef MP4_DUMPATOM
58 {int i;
59 printf("ESDS Dump (%dbyte):\n", datalen);
60 for(i = 0; i < datalen; i++)
61 printf("%02X ", data[i]);
62 printf("\nESDS Dumped\n");}
63 #endif
64 memset(esds, 0, sizeof(esds_t));
66 esds->version = stream_read_char(s);
67 esds->flags = stream_read_int24(s);
68 mp_msg(MSGT_DEMUX, MP4_DL,
69 "ESDS MPEG4 version: %d flags: 0x%06X\n",
70 esds->version, esds->flags);
72 /* get and verify ES_DescrTag */
73 if (stream_read_char(s) == MP4ESDescrTag) {
74 /* read length */
75 len = mp4_read_descr_len(s);
77 esds->ESId = stream_read_word(s);
78 esds->streamPriority = stream_read_char(s);
79 mp_msg(MSGT_DEMUX, MP4_DL,
80 "ESDS MPEG4 ES Descriptor (%dBytes):\n"
81 " -> ESId: %d\n"
82 " -> streamPriority: %d\n",
83 len, esds->ESId, esds->streamPriority);
85 if (len < (5 + 15)) {
86 freereturn(s,1);
88 } else {
89 esds->ESId = stream_read_word(s);
90 mp_msg(MSGT_DEMUX, MP4_DL,
91 "ESDS MPEG4 ES Descriptor (%dBytes):\n"
92 " -> ESId: %d\n", 2, esds->ESId);
95 /* get and verify DecoderConfigDescrTab */
96 if (stream_read_char(s) != MP4DecConfigDescrTag) {
97 freereturn(s,1);
100 /* read length */
101 len = mp4_read_descr_len(s);
103 esds->objectTypeId = stream_read_char(s);
104 esds->streamType = stream_read_char(s);
105 esds->bufferSizeDB = stream_read_int24(s);
106 esds->maxBitrate = stream_read_dword(s);
107 esds->avgBitrate = stream_read_dword(s);
108 mp_msg(MSGT_DEMUX, MP4_DL,
109 "ESDS MPEG4 Decoder Config Descriptor (%dBytes):\n"
110 " -> objectTypeId: %d\n"
111 " -> streamType: 0x%02X\n"
112 " -> bufferSizeDB: 0x%06X\n"
113 " -> maxBitrate: %.3fkbit/s\n"
114 " -> avgBitrate: %.3fkbit/s\n",
115 len, esds->objectTypeId, esds->streamType,
116 esds->bufferSizeDB, esds->maxBitrate/1000.0,
117 esds->avgBitrate/1000.0);
119 esds->decoderConfigLen=0;
121 if (len < 15) {
122 freereturn(s,0);
125 /* get and verify DecSpecificInfoTag */
126 if (stream_read_char(s) != MP4DecSpecificDescrTag) {
127 freereturn(s,0);
130 /* read length */
131 esds->decoderConfigLen = len = mp4_read_descr_len(s);
133 esds->decoderConfig = malloc(esds->decoderConfigLen);
134 if (esds->decoderConfig) {
135 stream_read(s, esds->decoderConfig, esds->decoderConfigLen);
136 } else {
137 esds->decoderConfigLen = 0;
139 mp_msg(MSGT_DEMUX, MP4_DL,
140 "ESDS MPEG4 Decoder Specific Descriptor (%dBytes)\n", len);
142 /* get and verify SLConfigDescrTag */
143 if(stream_read_char(s) != MP4SLConfigDescrTag) {
144 freereturn(s,0);
147 /* Note: SLConfig is usually constant value 2, size 1Byte */
148 esds->SLConfigLen = len = mp4_read_descr_len(s);
149 esds->SLConfig = malloc(esds->SLConfigLen);
150 if (esds->SLConfig) {
151 stream_read(s, esds->SLConfig, esds->SLConfigLen);
152 } else {
153 esds->SLConfigLen = 0;
155 mp_msg(MSGT_DEMUX, MP4_DL,
156 "ESDS MPEG4 Sync Layer Config Descriptor (%dBytes)\n"
157 " -> predefined: %d\n", len, esds->SLConfig[0]);
159 /* will skip the remainder of the atom */
160 freereturn(s,0);
164 /* cleanup all mem occupied by mp4_parse_esds */
165 void mp4_free_esds(esds_t *esds) {
166 if(esds->decoderConfigLen)
167 free(esds->decoderConfig);
168 if(esds->SLConfigLen)
169 free(esds->SLConfig);
172 #undef freereturn
173 #undef MP4_DL