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|---|---|---|---|
| 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/attributes.h" | ||
| 27 | #include "libavutil/mem.h" | ||
| 28 | #include "libavcodec/get_bits.h" | ||
| 29 | #include "avformat.h" | ||
| 30 | #include "internal.h" | ||
| 31 | #include "oggdec.h" | ||
| 32 | |||
| 33 | typedef struct TheoraParams { | ||
| 34 | int gpshift; | ||
| 35 | int gpmask; | ||
| 36 | unsigned version; | ||
| 37 | } TheoraParams; | ||
| 38 | |||
| 39 | 21 | static int theora_header(AVFormatContext *s, int idx) | |
| 40 | { | ||
| 41 | 21 | struct ogg *ogg = s->priv_data; | |
| 42 | 21 | struct ogg_stream *os = ogg->streams + idx; | |
| 43 | 21 | AVStream *st = s->streams[idx]; | |
| 44 | 21 | TheoraParams *thp = os->private; | |
| 45 | 21 | int cds = st->codecpar->extradata_size + os->psize + 2; | |
| 46 | int err; | ||
| 47 | uint8_t *cdp; | ||
| 48 | |||
| 49 |
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21 | if (!(os->buf[os->pstart] & 0x80)) |
| 50 | 6 | return 0; | |
| 51 | |||
| 52 |
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15 | if (!thp) { |
| 53 | 5 | thp = av_mallocz(sizeof(*thp)); | |
| 54 |
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5 | if (!thp) |
| 55 | ✗ | return AVERROR(ENOMEM); | |
| 56 | 5 | os->private = thp; | |
| 57 | } | ||
| 58 | |||
| 59 |
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15 | switch (os->buf[os->pstart]) { |
| 60 | 5 | case 0x80: { | |
| 61 | GetBitContext gb; | ||
| 62 | AVRational timebase; | ||
| 63 | |||
| 64 | 5 | init_get_bits(&gb, os->buf + os->pstart, os->psize * 8); | |
| 65 | |||
| 66 | /* 0x80"theora" */ | ||
| 67 | 5 | skip_bits_long(&gb, 7 * 8); | |
| 68 | |||
| 69 | 5 | thp->version = get_bits(&gb, 24); | |
| 70 |
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5 | if (thp->version < 0x030100) { |
| 71 | ✗ | av_log(s, AV_LOG_ERROR, | |
| 72 | "Too old or unsupported Theora (%x)\n", thp->version); | ||
| 73 | ✗ | return AVERROR(ENOSYS); | |
| 74 | } | ||
| 75 | |||
| 76 | 5 | st->codecpar->width = get_bits(&gb, 16) << 4; | |
| 77 | 5 | st->codecpar->height = get_bits(&gb, 16) << 4; | |
| 78 | |||
| 79 |
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5 | if (thp->version >= 0x030400) |
| 80 | ✗ | skip_bits(&gb, 100); | |
| 81 | |||
| 82 |
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5 | if (thp->version >= 0x030200) { |
| 83 | 5 | int width = get_bits(&gb, 24); | |
| 84 | 5 | int height = get_bits(&gb, 24); | |
| 85 |
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5 | if (width <= st->codecpar->width && width > st->codecpar->width - 16 && |
| 86 |
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3 | height <= st->codecpar->height && height > st->codecpar->height - 16) { |
| 87 | 3 | st->codecpar->width = width; | |
| 88 | 3 | st->codecpar->height = height; | |
| 89 | } | ||
| 90 | |||
| 91 | 5 | skip_bits(&gb, 16); | |
| 92 | } | ||
| 93 | |||
| 94 | 5 | timebase.den = get_bits_long(&gb, 32); | |
| 95 | 5 | timebase.num = get_bits_long(&gb, 32); | |
| 96 |
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5 | if (!(timebase.num > 0 && timebase.den > 0)) { |
| 97 | ✗ | av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n"); | |
| 98 | ✗ | timebase.num = 1; | |
| 99 | ✗ | timebase.den = 25; | |
| 100 | } | ||
| 101 | 5 | avpriv_set_pts_info(st, 64, timebase.num, timebase.den); | |
| 102 | |||
| 103 | 5 | st->sample_aspect_ratio.num = get_bits(&gb, 24); | |
| 104 | 5 | st->sample_aspect_ratio.den = get_bits(&gb, 24); | |
| 105 | |||
| 106 |
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5 | if (thp->version >= 0x030200) |
| 107 | 5 | skip_bits_long(&gb, 38); | |
| 108 |
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5 | if (thp->version >= 0x304000) |
| 109 | ✗ | skip_bits(&gb, 2); | |
| 110 | |||
| 111 | 5 | thp->gpshift = get_bits(&gb, 5); | |
| 112 | 5 | thp->gpmask = (1U << thp->gpshift) - 1; | |
| 113 | |||
| 114 | 5 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 115 | 5 | st->codecpar->codec_id = AV_CODEC_ID_THEORA; | |
| 116 | 5 | ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS; | |
| 117 | } | ||
| 118 | 5 | break; | |
| 119 | 5 | case 0x81: | |
| 120 | 5 | ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 7, os->psize - 7); | |
| 121 | av_fallthrough; | ||
| 122 | 10 | case 0x82: | |
| 123 |
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10 | if (!thp->version) |
| 124 | ✗ | return AVERROR_INVALIDDATA; | |
| 125 | 10 | break; | |
| 126 | ✗ | default: | |
| 127 | ✗ | av_log(s, AV_LOG_ERROR, "Unknown header type %X\n", os->buf[os->pstart]); | |
| 128 | ✗ | return AVERROR_INVALIDDATA; | |
| 129 | } | ||
| 130 | |||
| 131 |
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15 | if ((err = av_reallocp(&st->codecpar->extradata, |
| 132 | 15 | cds + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) { | |
| 133 | ✗ | st->codecpar->extradata_size = 0; | |
| 134 | ✗ | return err; | |
| 135 | } | ||
| 136 | 15 | memset(st->codecpar->extradata + cds, 0, AV_INPUT_BUFFER_PADDING_SIZE); | |
| 137 | |||
| 138 | 15 | cdp = st->codecpar->extradata + st->codecpar->extradata_size; | |
| 139 | 15 | *cdp++ = os->psize >> 8; | |
| 140 | 15 | *cdp++ = os->psize & 0xff; | |
| 141 | 15 | memcpy(cdp, os->buf + os->pstart, os->psize); | |
| 142 | 15 | st->codecpar->extradata_size = cds; | |
| 143 | |||
| 144 | 15 | return 1; | |
| 145 | } | ||
| 146 | |||
| 147 | 215 | static uint64_t theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, | |
| 148 | int64_t *dts) | ||
| 149 | { | ||
| 150 | 215 | struct ogg *ogg = ctx->priv_data; | |
| 151 | 215 | struct ogg_stream *os = ogg->streams + idx; | |
| 152 | 215 | TheoraParams *thp = os->private; | |
| 153 | uint64_t iframe, pframe; | ||
| 154 | |||
| 155 |
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215 | if (!thp) |
| 156 | ✗ | return AV_NOPTS_VALUE; | |
| 157 | |||
| 158 | 215 | iframe = gp >> thp->gpshift; | |
| 159 | 215 | pframe = gp & thp->gpmask; | |
| 160 | |||
| 161 |
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215 | if (thp->version < 0x030201) |
| 162 | ✗ | iframe++; | |
| 163 | |||
| 164 |
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215 | if (!pframe) |
| 165 | 61 | os->pflags |= AV_PKT_FLAG_KEY; | |
| 166 | |||
| 167 |
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215 | if (dts) |
| 168 | 32 | *dts = iframe + pframe; | |
| 169 | |||
| 170 | 215 | return iframe + pframe; | |
| 171 | } | ||
| 172 | |||
| 173 | 193 | static int theora_packet(AVFormatContext *s, int idx) | |
| 174 | { | ||
| 175 | 193 | struct ogg *ogg = s->priv_data; | |
| 176 | 193 | struct ogg_stream *os = ogg->streams + idx; | |
| 177 | int duration; | ||
| 178 | |||
| 179 | /* first packet handling | ||
| 180 | here we parse the duration of each packet in the first page and compare | ||
| 181 | the total duration to the page granule to find the encoder delay and | ||
| 182 | set the first timestamp */ | ||
| 183 | |||
| 184 |
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193 | if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) { |
| 185 | int seg; | ||
| 186 | int64_t pts; | ||
| 187 | |||
| 188 | 128 | duration = 1; | |
| 189 |
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1274 | for (seg = os->segp; seg < os->nsegs; seg++) { |
| 190 |
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1146 | if (os->segments[seg] < 255) |
| 191 | 1146 | duration ++; | |
| 192 | } | ||
| 193 | |||
| 194 | 128 | pts = theora_gptopts(s, idx, os->granule, NULL); | |
| 195 |
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128 | if (pts != AV_NOPTS_VALUE) |
| 196 | 128 | pts = av_sat_sub64(pts, duration); | |
| 197 | 128 | os->lastpts = os->lastdts = pts; | |
| 198 |
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128 | if(s->streams[idx]->start_time == AV_NOPTS_VALUE && os->lastpts != AV_NOPTS_VALUE) { |
| 199 | 3 | s->streams[idx]->start_time = os->lastpts; | |
| 200 |
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3 | if (s->streams[idx]->duration > 0) |
| 201 | 3 | s->streams[idx]->duration = av_sat_sub64(s->streams[idx]->duration, s->streams[idx]->start_time); | |
| 202 | } | ||
| 203 | } | ||
| 204 | |||
| 205 | /* parse packet duration */ | ||
| 206 |
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193 | if (os->psize > 0) { |
| 207 | 45 | os->pduration = 1; | |
| 208 | } | ||
| 209 | |||
| 210 | 193 | return 0; | |
| 211 | } | ||
| 212 | |||
| 213 | const struct ogg_codec ff_theora_codec = { | ||
| 214 | .magic = "\200theora", | ||
| 215 | .magicsize = 7, | ||
| 216 | .header = theora_header, | ||
| 217 | .packet = theora_packet, | ||
| 218 | .gptopts = theora_gptopts, | ||
| 219 | .nb_header = 3, | ||
| 220 | }; | ||
| 221 |