| 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 | |
| 32 | typedef struct TheoraParams { |
| 33 | int gpshift; |
| 34 | int gpmask; |
| 35 | unsigned version; |
| 36 | } TheoraParams; |
| 37 | |
| 38 | static int theora_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 | TheoraParams *thp = os->private; |
| 44 | int cds = st->codec->extradata_size + os->psize + 2; |
| 45 | int err; |
| 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 | if (!thp) |
| 54 | return AVERROR(ENOMEM); |
| 55 | os->private = thp; |
| 56 | } |
| 57 | |
| 58 | switch (os->buf[os->pstart]) { |
| 59 | case 0x80: { |
| 60 | GetBitContext gb; |
| 61 | AVRational timebase; |
| 62 | |
| 63 | init_get_bits(&gb, os->buf + os->pstart, os->psize * 8); |
| 64 | |
| 65 | /* 0x80"theora" */ |
| 66 | skip_bits_long(&gb, 7 * 8); |
| 67 | |
| 68 | thp->version = get_bits_long(&gb, 24); |
| 69 | if (thp->version < 0x030100) { |
| 70 | av_log(s, AV_LOG_ERROR, |
| 71 | "Too old or unsupported Theora (%x)\n", thp->version); |
| 72 | return AVERROR(ENOSYS); |
| 73 | } |
| 74 | |
| 75 | st->codec->width = get_bits(&gb, 16) << 4; |
| 76 | st->codec->height = get_bits(&gb, 16) << 4; |
| 77 | |
| 78 | if (thp->version >= 0x030400) |
| 79 | skip_bits(&gb, 100); |
| 80 | |
| 81 | if (thp->version >= 0x030200) { |
| 82 | int width = get_bits_long(&gb, 24); |
| 83 | int height = get_bits_long(&gb, 24); |
| 84 | if (width <= st->codec->width && width > st->codec->width - 16 && |
| 85 | height <= st->codec->height && height > st->codec->height - 16) { |
| 86 | st->codec->width = width; |
| 87 | st->codec->height = height; |
| 88 | } |
| 89 | |
| 90 | skip_bits(&gb, 16); |
| 91 | } |
| 92 | |
| 93 | timebase.den = get_bits_long(&gb, 32); |
| 94 | timebase.num = get_bits_long(&gb, 32); |
| 95 | if (!(timebase.num > 0 && timebase.den > 0)) { |
| 96 | av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n"); |
| 97 | timebase.num = 1; |
| 98 | timebase.den = 25; |
| 99 | } |
| 100 | avpriv_set_pts_info(st, 64, timebase.num, timebase.den); |
| 101 | |
| 102 | st->sample_aspect_ratio.num = get_bits_long(&gb, 24); |
| 103 | st->sample_aspect_ratio.den = get_bits_long(&gb, 24); |
| 104 | |
| 105 | if (thp->version >= 0x030200) |
| 106 | skip_bits_long(&gb, 38); |
| 107 | if (thp->version >= 0x304000) |
| 108 | skip_bits(&gb, 2); |
| 109 | |
| 110 | thp->gpshift = get_bits(&gb, 5); |
| 111 | thp->gpmask = (1 << thp->gpshift) - 1; |
| 112 | |
| 113 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 114 | st->codec->codec_id = AV_CODEC_ID_THEORA; |
| 115 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
| 116 | } |
| 117 | break; |
| 118 | case 0x81: |
| 119 | ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 7, os->psize - 7); |
| 120 | case 0x82: |
| 121 | if (!thp->version) |
| 122 | return AVERROR_INVALIDDATA; |
| 123 | break; |
| 124 | default: |
| 125 | av_log(s, AV_LOG_ERROR, "Unknown header type %X\n", os->buf[os->pstart]); |
| 126 | return AVERROR_INVALIDDATA; |
| 127 | } |
| 128 | |
| 129 | if ((err = av_reallocp(&st->codec->extradata, |
| 130 | cds + FF_INPUT_BUFFER_PADDING_SIZE)) < 0) { |
| 131 | st->codec->extradata_size = 0; |
| 132 | return err; |
| 133 | } |
| 134 | memset(st->codec->extradata + cds, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
| 135 | |
| 136 | cdp = st->codec->extradata + st->codec->extradata_size; |
| 137 | *cdp++ = os->psize >> 8; |
| 138 | *cdp++ = os->psize & 0xff; |
| 139 | memcpy(cdp, os->buf + os->pstart, os->psize); |
| 140 | st->codec->extradata_size = cds; |
| 141 | |
| 142 | return 1; |
| 143 | } |
| 144 | |
| 145 | static uint64_t theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, |
| 146 | int64_t *dts) |
| 147 | { |
| 148 | struct ogg *ogg = ctx->priv_data; |
| 149 | struct ogg_stream *os = ogg->streams + idx; |
| 150 | TheoraParams *thp = os->private; |
| 151 | uint64_t iframe, pframe; |
| 152 | |
| 153 | if (!thp) |
| 154 | return AV_NOPTS_VALUE; |
| 155 | |
| 156 | iframe = gp >> thp->gpshift; |
| 157 | pframe = gp & thp->gpmask; |
| 158 | |
| 159 | if (thp->version < 0x030201) |
| 160 | iframe++; |
| 161 | |
| 162 | if (!pframe) |
| 163 | os->pflags |= AV_PKT_FLAG_KEY; |
| 164 | |
| 165 | if (dts) |
| 166 | *dts = iframe + pframe; |
| 167 | |
| 168 | return iframe + pframe; |
| 169 | } |
| 170 | |
| 171 | static int theora_packet(AVFormatContext *s, int idx) |
| 172 | { |
| 173 | struct ogg *ogg = s->priv_data; |
| 174 | struct ogg_stream *os = ogg->streams + idx; |
| 175 | int duration; |
| 176 | |
| 177 | /* first packet handling |
| 178 | here we parse the duration of each packet in the first page and compare |
| 179 | the total duration to the page granule to find the encoder delay and |
| 180 | set the first timestamp */ |
| 181 | |
| 182 | if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) { |
| 183 | int seg; |
| 184 | |
| 185 | duration = 1; |
| 186 | for (seg = os->segp; seg < os->nsegs; seg++) { |
| 187 | if (os->segments[seg] < 255) |
| 188 | duration ++; |
| 189 | } |
| 190 | |
| 191 | os->lastpts = os->lastdts = theora_gptopts(s, idx, os->granule, NULL) - duration; |
| 192 | if(s->streams[idx]->start_time == AV_NOPTS_VALUE) { |
| 193 | s->streams[idx]->start_time = os->lastpts; |
| 194 | if (s->streams[idx]->duration) |
| 195 | s->streams[idx]->duration -= s->streams[idx]->start_time; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | /* parse packet duration */ |
| 200 | if (os->psize > 0) { |
| 201 | os->pduration = 1; |
| 202 | } |
| 203 | |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | const struct ogg_codec ff_theora_codec = { |
| 208 | .magic = "\200theora", |
| 209 | .magicsize = 7, |
| 210 | .header = theora_header, |
| 211 | .packet = theora_packet, |
| 212 | .gptopts = theora_gptopts, |
| 213 | .nb_header = 3, |
| 214 | }; |