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/get_bits.h" 28#include "avformat.h" 29#include "internal.h" 30#include "oggdec.h" 31 32struct theora_params { 33 int gpshift; 34 int gpmask; 35 unsigned version; 36}; 37 38static int 39theora_header (AVFormatContext * s, int idx) 40{ 41 struct ogg *ogg = s->priv_data; 42 struct ogg_stream *os = ogg->streams + idx; 43 AVStream *st = s->streams[idx]; 44 struct theora_params *thp = os->private; 45 int cds = st->codec->extradata_size + os->psize + 2; 46 uint8_t *cdp; 47 48 if(!(os->buf[os->pstart] & 0x80)) 49 return 0; 50 51 if(!thp){ 52 thp = av_mallocz(sizeof(*thp)); 53 os->private = thp; 54 } 55 56 if (os->buf[os->pstart] == 0x80) { 57 GetBitContext gb; 58 int width, height; 59 60 init_get_bits(&gb, os->buf + os->pstart, os->psize*8); 61 62 skip_bits_long(&gb, 7*8); /* 0x80"theora" */ 63 64 thp->version = get_bits_long(&gb, 24); 65 if (thp->version < 0x030100) 66 { 67 av_log(s, AV_LOG_ERROR, 68 "Too old or unsupported Theora (%x)\n", thp->version); 69 return -1; 70 } 71 72 width = get_bits(&gb, 16) << 4; 73 height = get_bits(&gb, 16) << 4; 74 avcodec_set_dimensions(st->codec, width, height); 75 76 if (thp->version >= 0x030400) 77 skip_bits(&gb, 100); 78 79 if (thp->version >= 0x030200) { 80 width = get_bits_long(&gb, 24); 81 height = get_bits_long(&gb, 24); 82 if ( width <= st->codec->width && width > st->codec->width-16 83 && height <= st->codec->height && height > st->codec->height-16) 84 avcodec_set_dimensions(st->codec, width, height); 85 86 skip_bits(&gb, 16); 87 } 88 st->codec->time_base.den = get_bits_long(&gb, 32); 89 st->codec->time_base.num = get_bits_long(&gb, 32); 90 if (!(st->codec->time_base.num > 0 && st->codec->time_base.den > 0)) { 91 av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n"); 92 st->codec->time_base.num = 1; 93 st->codec->time_base.den = 25; 94 } 95 avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den); 96 97 st->sample_aspect_ratio.num = get_bits_long(&gb, 24); 98 st->sample_aspect_ratio.den = get_bits_long(&gb, 24); 99 100 if (thp->version >= 0x030200) 101 skip_bits_long(&gb, 38); 102 if (thp->version >= 0x304000) 103 skip_bits(&gb, 2); 104 105 thp->gpshift = get_bits(&gb, 5); 106 thp->gpmask = (1 << thp->gpshift) - 1; 107 108 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 109 st->codec->codec_id = CODEC_ID_THEORA; 110 st->need_parsing = AVSTREAM_PARSE_HEADERS; 111 112 } else if (os->buf[os->pstart] == 0x83) { 113 ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8); 114 } 115 116 st->codec->extradata = av_realloc (st->codec->extradata, 117 cds + FF_INPUT_BUFFER_PADDING_SIZE); 118 cdp = st->codec->extradata + st->codec->extradata_size; 119 *cdp++ = os->psize >> 8; 120 *cdp++ = os->psize & 0xff; 121 memcpy (cdp, os->buf + os->pstart, os->psize); 122 st->codec->extradata_size = cds; 123 124 return 1; 125} 126 127static uint64_t 128theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, int64_t *dts) 129{ 130 struct ogg *ogg = ctx->priv_data; 131 struct ogg_stream *os = ogg->streams + idx; 132 struct theora_params *thp = os->private; 133 uint64_t iframe = gp >> thp->gpshift; 134 uint64_t pframe = gp & thp->gpmask; 135 136 if (thp->version < 0x030201) 137 iframe++; 138 139 if(!pframe) 140 os->pflags |= AV_PKT_FLAG_KEY; 141 142 if (dts) 143 *dts = iframe + pframe; 144 145 return iframe + pframe; 146} 147 148const struct ogg_codec ff_theora_codec = { 149 .magic = "\200theora", 150 .magicsize = 7, 151 .header = theora_header, 152 .gptopts = theora_gptopts 153}; 154