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author | atmos4 <atmos4@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-03-24 02:25:41 +0000 |
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committer | atmos4 <atmos4@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-03-24 02:25:41 +0000 |
commit | 086814f29412aac40b43a35e807a76090f2f500c (patch) | |
tree | 896534f281478e6821b6bfd2a47b52f037fb3b21 /libmpdemux/parse_mp4.c | |
parent | 52457a7c61c17b7d098df8b7c6cf0c24aec782ad (diff) | |
download | mpv-086814f29412aac40b43a35e807a76090f2f500c.tar.bz2 mpv-086814f29412aac40b43a35e807a76090f2f500c.tar.xz |
Improved MP4 parsing (finally)
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@5302 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libmpdemux/parse_mp4.c')
-rw-r--r-- | libmpdemux/parse_mp4.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/libmpdemux/parse_mp4.c b/libmpdemux/parse_mp4.c new file mode 100644 index 0000000000..e17703e6d5 --- /dev/null +++ b/libmpdemux/parse_mp4.c @@ -0,0 +1,114 @@ +/* parse_mp4.c - MP4 file format parser code + * This file is part of MPlayer, see http://mplayerhq.hu/ for info. + * (c)2002 by Felix Buenemann <atmosfear at users.sourceforge.net> + * File licensed under the GPL, see http://www.fsf.org/ for more info. + * Code inspired by libmp4 from http://mpeg4ip.sourceforge.net/. + */ + +#include <stdio.h> +#include <inttypes.h> +#include <malloc.h> +#include "parse_mp4.h" +#include "mp_msg.h" +#include "stream.h" + +#define MP4_DL MSGL_V + +int mp4_read_descr_len(stream_t *s) { + uint8_t b; + uint8_t numBytes = 0; + uint32_t length = 0; + + do { + b = stream_read_char(s); + numBytes++; + length = (length << 7) | (b & 0x7F); + } while ((b & 0x80) && numBytes < 4); + + return length; +} + +int mp4_parse_esds(unsigned char *data, int datalen, esds_t *esds) { + /* create memory stream from data */ + stream_t *s = new_memory_stream(data, datalen); + uint8_t tag; + uint8_t len; + + esds->version = stream_read_char(s); + esds->flags = stream_read_int24(s); + mp_msg(MSGT_DEMUX, MP4_DL, + "ESDS MPEG4 version: %d flags: 0x%06X\n", + esds->version, esds->flags); + + /* get and verify ES_DescrTag */ + tag = stream_read_char(s); + if (tag == MP4ESDescrTag) { + /* read length */ + if ((len = mp4_read_descr_len(s)) < 5 + 15) { + return 1; + } + esds->ESId = stream_read_word(s); + esds->streamPriority = stream_read_char(s); + } else { +#if 1 /* 1 == guessed */ + esds->ESId = stream_read_word(s); +#else + /* skip 2 bytes */ + stream_skip(s, 2); +#endif + } + mp_msg(MSGT_DEMUX, MP4_DL, + "ESDS MPEG4 ES Descriptor (%dBytes):\n" + " -> ESId: %d\n" + " -> streamPriority: %d\n", + len, esds->ESId, esds->streamPriority); + + /* get and verify DecoderConfigDescrTab */ + if (stream_read_char(s) != MP4DecConfigDescrTag) { + return 1; + } + + /* read length */ + if ((len = mp4_read_descr_len(s)) < 15) { + return 1; + } + + esds->objectTypeId = stream_read_char(s); + esds->streamType = stream_read_char(s); + esds->bufferSizeDB = stream_read_int24(s); + esds->maxBitrate = stream_read_dword(s); + esds->avgBitrate = stream_read_dword(s); + mp_msg(MSGT_DEMUX, MP4_DL, + "ESDS MPEG4 Decoder Config Descriptor (%dBytes):\n" + " -> objectTypeId: %d\n" + " -> streamType: 0x%02X\n" + " -> bufferSizeDB: 0x%06X\n" + " -> maxBitrate: %.3fkbit/s\n" + " -> avgBitrate: %.3fkbit/s\n", + len, esds->objectTypeId, esds->streamType, + esds->bufferSizeDB, esds->maxBitrate/1000.0, + esds->avgBitrate/1000.0); + + /* get and verify DecSpecificInfoTag */ + if (stream_read_char(s) != MP4DecSpecificDescrTag) { + return 1; + } + + /* read length */ + esds->decoderConfigLen = len = mp4_read_descr_len(s); + + free(esds->decoderConfig); + esds->decoderConfig = malloc(esds->decoderConfigLen); + if (esds->decoderConfig) { + stream_read(s, esds->decoderConfig, esds->decoderConfigLen); + } else { + esds->decoderConfigLen = 0; + } + mp_msg(MSGT_DEMUX, MP4_DL, + "ESDS MPEG4 Decoder Specific Descriptor (%dBytes)\n", len); + + /* will skip the remainder of the atom */ + return 0; + +} + |