mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 11498 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Aurelien Jacobs
17 years ago
parent
6e6eebf919
commit
1bd2d763d4
4 changed files with 172 additions and 118 deletions
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/*
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* AVC helper functions for muxers |
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* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#include "avio.h" |
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static uint8_t *avc_find_startcode( uint8_t *p, uint8_t *end ) |
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{ |
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uint8_t *a = p + 4 - ((long)p & 3); |
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for( end -= 3; p < a && p < end; p++ ) { |
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if( p[0] == 0 && p[1] == 0 && p[2] == 1 ) |
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return p; |
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} |
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for( end -= 3; p < end; p += 4 ) { |
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uint32_t x = *(uint32_t*)p; |
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// if( (x - 0x01000100) & (~x) & 0x80008000 ) // little endian
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// if( (x - 0x00010001) & (~x) & 0x00800080 ) // big endian
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if( (x - 0x01010101) & (~x) & 0x80808080 ) { // generic
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if( p[1] == 0 ) { |
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if( p[0] == 0 && p[2] == 1 ) |
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return p-1; |
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if( p[2] == 0 && p[3] == 1 ) |
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return p; |
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} |
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if( p[3] == 0 ) { |
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if( p[2] == 0 && p[4] == 1 ) |
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return p+1; |
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if( p[4] == 0 && p[5] == 1 ) |
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return p+2; |
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} |
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} |
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} |
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for( end += 3; p < end; p++ ) { |
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if( p[0] == 0 && p[1] == 0 && p[2] == 1 ) |
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return p; |
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} |
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return end + 3; |
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} |
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int avc_parse_nal_units(uint8_t *buf_in, uint8_t **buf, int *size) |
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{ |
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ByteIOContext *pb; |
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uint8_t *p = buf_in; |
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uint8_t *end = p + *size; |
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uint8_t *nal_start, *nal_end; |
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int ret = url_open_dyn_buf(&pb); |
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if(ret < 0) |
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return ret; |
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nal_start = avc_find_startcode(p, end); |
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while (nal_start < end) { |
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while(!*(nal_start++)); |
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nal_end = avc_find_startcode(nal_start, end); |
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put_be32(pb, nal_end - nal_start); |
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put_buffer(pb, nal_start, nal_end - nal_start); |
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nal_start = nal_end; |
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} |
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av_freep(buf); |
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*size = url_close_dyn_buf(pb, buf); |
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return 0; |
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} |
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int isom_write_avcc(ByteIOContext *pb, uint8_t *data, int len) |
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{ |
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if (len > 6) { |
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/* check for h264 start code */ |
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if (AV_RB32(data) == 0x00000001) { |
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uint8_t *buf=NULL, *end; |
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uint32_t sps_size=0, pps_size=0; |
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uint8_t *sps=0, *pps=0; |
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int ret = avc_parse_nal_units(data, &buf, &len); |
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if (ret < 0) |
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return ret; |
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data = buf; |
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end = buf + len; |
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/* look for sps and pps */ |
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while (buf < end) { |
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unsigned int size; |
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uint8_t nal_type; |
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size = AV_RB32(buf); |
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nal_type = buf[4] & 0x1f; |
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if (nal_type == 7) { /* SPS */ |
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sps = buf + 4; |
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sps_size = size; |
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} else if (nal_type == 8) { /* PPS */ |
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pps = buf + 4; |
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pps_size = size; |
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} |
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buf += size + 4; |
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} |
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assert(sps); |
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assert(pps); |
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put_byte(pb, 1); /* version */ |
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put_byte(pb, sps[1]); /* profile */ |
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put_byte(pb, sps[2]); /* profile compat */ |
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put_byte(pb, sps[3]); /* level */ |
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put_byte(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */ |
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put_byte(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */ |
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put_be16(pb, sps_size); |
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put_buffer(pb, sps, sps_size); |
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put_byte(pb, 1); /* number of pps */ |
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put_be16(pb, pps_size); |
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put_buffer(pb, pps, pps_size); |
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av_free(data); |
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} else { |
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put_buffer(pb, data, len); |
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} |
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} |
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return 0; |
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} |
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@ -0,0 +1,31 @@ |
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/*
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* AVC helper functions for muxers |
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* Copyright (c) 2008 Aurelien Jacobs <aurel@gnuage.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVC_H |
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#define AVC_H |
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#include <stdint.h> |
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#include "avio.h" |
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int avc_parse_nal_units(uint8_t *buf_in, uint8_t **buf, int *size); |
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int isom_write_avcc(ByteIOContext *pb, uint8_t *data, int len); |
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#endif /* AVC_H */ |
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