oggparsedaala.c 7.41 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
/*
 * Ogg Daala parser
 * Copyright (C) 2015 Rostislav Pehlivanov <atomnuker gmail com>
 * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara gmail com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdlib.h>
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "internal.h"
#include "oggdec.h"

struct DaalaPixFmtMap {
    enum AVPixelFormat ffmpeg_fmt;
    int depth;
    int planes;
    int xdec[4];
    int ydec[4];
};

/* Currently supported formats only */
static const struct DaalaPixFmtMap list_fmts[] = {
    { AV_PIX_FMT_YUV420P,  8, 3, {0, 1, 1, 0}, {0, 1, 1, 0} },
    { AV_PIX_FMT_YUV444P,  8, 3, {0, 0, 0, 0}, {0, 0, 0, 0} }
};

typedef struct DaalaInfoHeader {
    int init_d;
    int gpshift;
    int gpmask;
    int version_maj;
    int version_min;
    int version_sub;
    int frame_duration;
    int keyframe_granule_shift;
    struct DaalaPixFmtMap format;
} DaalaInfoHeader;

static inline int daala_match_pix_fmt(struct DaalaPixFmtMap *fmt)
{
    int i, j;
    for (i = 0; i < FF_ARRAY_ELEMS(list_fmts); i++) {
        int match = 0;
        if (fmt->depth != list_fmts[i].depth)
            continue;
        if (fmt->planes != list_fmts[i].planes)
            continue;
        for (j = 0; j < fmt->planes; j++) {
            if (fmt->xdec[j] != list_fmts[i].xdec[j])
                continue;
            if (fmt->ydec[j] != list_fmts[i].ydec[j])
                continue;
            match++;
        }
        if (match == fmt->planes)
            return list_fmts[i].ffmpeg_fmt;
    }
    return -1;
}

static int daala_header(AVFormatContext *s, int idx)
{
    int i, err;
    uint8_t *cdp;
    GetByteContext gb;
    AVRational timebase;
    struct ogg *ogg        = s->priv_data;
    struct ogg_stream *os  = ogg->streams + idx;
    AVStream *st           = s->streams[idx];
    int cds                = st->codec->extradata_size + os->psize + 2;
    DaalaInfoHeader *hdr   = os->private;

    if (!(os->buf[os->pstart] & 0x80))
        return 0;

    if (!hdr) {
        hdr = av_mallocz(sizeof(*hdr));
        if (!hdr)
            return AVERROR(ENOMEM);
        os->private = hdr;
    }

    switch (os->buf[os->pstart]) {
    case 0x80:
        bytestream2_init(&gb, os->buf + os->pstart, os->psize);
        bytestream2_skip(&gb, ff_daala_codec.magicsize);

        hdr->version_maj = bytestream2_get_byte(&gb);
        hdr->version_min = bytestream2_get_byte(&gb);
        hdr->version_sub = bytestream2_get_byte(&gb);

        st->codec->width  = bytestream2_get_ne32(&gb);
        st->codec->height = bytestream2_get_ne32(&gb);

        st->sample_aspect_ratio.num = bytestream2_get_ne32(&gb);
        st->sample_aspect_ratio.den = bytestream2_get_ne32(&gb);

        timebase.num = bytestream2_get_ne32(&gb);
        timebase.den = bytestream2_get_ne32(&gb);
        if (timebase.num < 0 && timebase.den < 0) {
            av_log(s, AV_LOG_WARNING, "Invalid timebase, assuming 30 FPS\n");
            timebase.num = 1;
            timebase.den = 30;
        }
        avpriv_set_pts_info(st, 64, timebase.den, timebase.num);

        hdr->frame_duration = bytestream2_get_ne32(&gb);
        hdr->gpshift = bytestream2_get_byte(&gb);
        hdr->gpmask  = (1 << hdr->gpshift) - 1;

        hdr->format.depth  = 8 + 2*(bytestream2_get_byte(&gb)-1);
        hdr->format.planes = bytestream2_get_byte(&gb);
        for (i = 0; i < hdr->format.planes; i++) {
            hdr->format.xdec[i] = bytestream2_get_byte(&gb);
            hdr->format.ydec[i] = bytestream2_get_byte(&gb);
        }

        if ((st->codec->pix_fmt = daala_match_pix_fmt(&hdr->format)) < 0)
            av_log(s, AV_LOG_ERROR, "Unsupported pixel format - %i %i\n",
                   hdr->format.depth, hdr->format.planes);

        st->codec->codec_id   = AV_CODEC_ID_DAALA;
        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
        st->need_parsing      = AVSTREAM_PARSE_HEADERS;

        hdr->init_d = 1;
        break;
    case 0x81:
        if (!hdr->init_d)
            return AVERROR_INVALIDDATA;
        ff_vorbis_stream_comment(s, st,
                                 os->buf + os->pstart + ff_daala_codec.magicsize,
                                 os->psize - ff_daala_codec.magicsize);
        break;
    case 0x82:
        if (!hdr->init_d)
            return AVERROR_INVALIDDATA;
        break;
    default:
        av_log(s, AV_LOG_ERROR, "Unknown header type %X\n", os->buf[os->pstart]);
        return AVERROR_INVALIDDATA;
        break;
    }

    if ((err = av_reallocp(&st->codec->extradata,
                           cds + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
        st->codec->extradata_size = 0;
        return err;
    }

    memset(st->codec->extradata + cds, 0, AV_INPUT_BUFFER_PADDING_SIZE);
    cdp    = st->codec->extradata + st->codec->extradata_size;
    *cdp++ = os->psize >> 8;
    *cdp++ = os->psize & 0xff;
    memcpy(cdp, os->buf + os->pstart, os->psize);
    st->codec->extradata_size = cds;

    return 1;
}

static uint64_t daala_gptopts(AVFormatContext *ctx, int idx, uint64_t gp,
                              int64_t *dts)
{
    uint64_t iframe, pframe;
    struct ogg *ogg       = ctx->priv_data;
    struct ogg_stream *os = ogg->streams + idx;
    DaalaInfoHeader *hdr  = os->private;

    if (!hdr)
        return AV_NOPTS_VALUE;

    iframe = gp >> hdr->gpshift;
    pframe = gp  & hdr->gpmask;

    if (!pframe)
        os->pflags |= AV_PKT_FLAG_KEY;

    if (dts)
        *dts = iframe + pframe;

    return iframe + pframe;
}

static int daala_packet(AVFormatContext *s, int idx)
{
    int seg, duration = 1;
    struct ogg *ogg = s->priv_data;
    struct ogg_stream *os = ogg->streams + idx;

    /*
     * first packet handling: here we parse the duration of each packet in the
     * first page and compare the total duration to the page granule to find the
     * encoder delay and set the first timestamp
     */

    if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
        for (seg = os->segp; seg < os->nsegs; seg++)
            if (os->segments[seg] < 255)
                duration++;

        os->lastpts = os->lastdts = daala_gptopts(s, idx, os->granule, NULL) - duration;
        if(s->streams[idx]->start_time == AV_NOPTS_VALUE) {
            s->streams[idx]->start_time = os->lastpts;
            if (s->streams[idx]->duration)
                s->streams[idx]->duration -= s->streams[idx]->start_time;
        }
    }

    /* parse packet duration */
    if (os->psize > 0)
        os->pduration = 1;

    return 0;
}

const struct ogg_codec ff_daala_codec = {
    .name             = "Daala",
    .magic            = "\200daala",
    .magicsize        = 6,
    .header           = daala_header,
    .packet           = daala_packet,
    .gptopts          = daala_gptopts,
    .granule_is_start = 1,
    .nb_header        = 3,
};