1/** 2 Copyright (C) 2005 Matthieu CASTET, Alex Beregszaszi 3 4 Permission is hereby granted, free of charge, to any person 5 obtaining a copy of this software and associated documentation 6 files (the "Software"), to deal in the Software without 7 restriction, including without limitation the rights to use, copy, 8 modify, merge, publish, distribute, sublicense, and/or sell copies 9 of the Software, and to permit persons to whom the Software is 10 furnished to do so, subject to the following conditions: 11 12 The above copyright notice and this permission notice shall be 13 included in all copies or substantial portions of the Software. 14 15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 19 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 DEALINGS IN THE SOFTWARE. 23**/ 24 25#include <stdlib.h> 26#include "libavutil/bswap.h" 27#include "libavcodec/bitstream.h" 28#include "avformat.h" 29#include "oggdec.h" 30 31struct theora_params { 32 int gpshift; 33 int gpmask; 34 unsigned version; 35}; 36 37static int 38theora_header (AVFormatContext * s, int idx) 39{ 40 struct ogg *ogg = s->priv_data; 41 struct ogg_stream *os = ogg->streams + idx; 42 AVStream *st = s->streams[idx]; 43 struct theora_params *thp = os->private; 44 int cds = st->codec->extradata_size + os->psize + 2; 45 uint8_t *cdp; 46 47 if(!(os->buf[os->pstart] & 0x80)) 48 return 0; 49 50 if(!thp){ 51 thp = av_mallocz(sizeof(*thp)); 52 os->private = thp; 53 } 54 55 if (os->buf[os->pstart] == 0x80) { 56 GetBitContext gb; 57 int width, height; 58 59 init_get_bits(&gb, os->buf + os->pstart, os->psize*8); 60 61 skip_bits(&gb, 7*8); /* 0x80"theora" */ 62 63 thp->version = get_bits_long(&gb, 24); 64 if (thp->version < 0x030100) 65 { 66 av_log(s, AV_LOG_ERROR, 67 "Too old or unsupported Theora (%x)\n", thp->version); 68 return -1; 69 } 70 71 width = get_bits(&gb, 16) << 4; 72 height = get_bits(&gb, 16) << 4; 73 avcodec_set_dimensions(st->codec, width, height); 74 75 if (thp->version >= 0x030400) 76 skip_bits(&gb, 100); 77 78 if (thp->version >= 0x030200) { 79 width = get_bits_long(&gb, 24); 80 height = get_bits_long(&gb, 24); 81 if ( width <= st->codec->width && width > st->codec->width-16 82 && height <= st->codec->height && height > st->codec->height-16) 83 avcodec_set_dimensions(st->codec, width, height); 84 85 skip_bits(&gb, 16); 86 } 87 st->codec->time_base.den = get_bits_long(&gb, 32); 88 st->codec->time_base.num = get_bits_long(&gb, 32); 89 st->time_base = st->codec->time_base; 90 91 st->sample_aspect_ratio.num = get_bits_long(&gb, 24); 92 st->sample_aspect_ratio.den = get_bits_long(&gb, 24); 93 94 if (thp->version >= 0x030200) 95 skip_bits(&gb, 38); 96 if (thp->version >= 0x304000) 97 skip_bits(&gb, 2); 98 99 thp->gpshift = get_bits(&gb, 5); 100 thp->gpmask = (1 << thp->gpshift) - 1; 101 102 st->codec->codec_type = CODEC_TYPE_VIDEO; 103 st->codec->codec_id = CODEC_ID_THEORA; 104 105 } else if (os->buf[os->pstart] == 0x83) { 106 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8); 107 } 108 109 st->codec->extradata = av_realloc (st->codec->extradata, cds); 110 cdp = st->codec->extradata + st->codec->extradata_size; 111 *cdp++ = os->psize >> 8; 112 *cdp++ = os->psize & 0xff; 113 memcpy (cdp, os->buf + os->pstart, os->psize); 114 st->codec->extradata_size = cds; 115 116 return 1; 117} 118 119static uint64_t 120theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp) 121{ 122 struct ogg *ogg = ctx->priv_data; 123 struct ogg_stream *os = ogg->streams + idx; 124 struct theora_params *thp = os->private; 125 uint64_t iframe = gp >> thp->gpshift; 126 uint64_t pframe = gp & thp->gpmask; 127 128 if (thp->version < 0x030201) 129 iframe++; 130 131 if(!pframe) 132 os->pflags |= PKT_FLAG_KEY; 133 134 return iframe + pframe; 135} 136 137const struct ogg_codec ff_theora_codec = { 138 .magic = "\200theora", 139 .magicsize = 7, 140 .header = theora_header, 141 .gptopts = theora_gptopts 142}; 143