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by Sérgio Benjamim
FFmpeg 2.7.1 source for ppsspp. |
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/*
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* On2 VP8 parser for Ogg
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* Copyright (C) 2013 James Almer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "oggdec.h" |
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#define VP8_HEADER_SIZE 26
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static int vp8_header(AVFormatContext *s, int idx) |
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{
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struct ogg *ogg = s->priv_data; |
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struct ogg_stream *os = ogg->streams + idx; |
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uint8_t *p = os->buf + os->pstart; |
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AVStream *st = s->streams[idx]; |
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AVRational framerate; |
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if (os->psize < 7 || p[0] != 0x4f) |
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return 0; |
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switch (p[5]){ |
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case 0x01: |
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if (os->psize < VP8_HEADER_SIZE) { |
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av_log(s, AV_LOG_ERROR, "Invalid OggVP8 header packet"); |
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return AVERROR_INVALIDDATA; |
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}
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if (p[6] != 1) { |
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av_log(s, AV_LOG_WARNING, |
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"Unknown OggVP8 version %d.%d\n", p[6], p[7]); |
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return AVERROR_INVALIDDATA; |
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}
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st->codec->width = AV_RB16(p + 8); |
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st->codec->height = AV_RB16(p + 10); |
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st->sample_aspect_ratio.num = AV_RB24(p + 12); |
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st->sample_aspect_ratio.den = AV_RB24(p + 15); |
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framerate.num = AV_RB32(p + 18); |
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framerate.den = AV_RB32(p + 22); |
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avpriv_set_pts_info(st, 64, framerate.den, framerate.num); |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codec->codec_id = AV_CODEC_ID_VP8; |
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st->need_parsing = AVSTREAM_PARSE_HEADERS; |
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break; |
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case 0x02: |
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if (p[6] != 0x20) |
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return AVERROR_INVALIDDATA; |
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ff_vorbis_stream_comment(s, st, p + 7, os->psize - 7); |
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break; |
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default: |
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av_log(s, AV_LOG_ERROR, "Unknown VP8 header type 0x%02X\n", p[5]); |
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return AVERROR_INVALIDDATA; |
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}
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return 1; |
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}
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static uint64_t vp8_gptopts(AVFormatContext *s, int idx, |
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uint64_t granule, int64_t *dts) |
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{
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struct ogg *ogg = s->priv_data; |
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struct ogg_stream *os = ogg->streams + idx; |
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uint64_t pts = (granule >> 32); |
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uint32_t dist = (granule >> 3) & 0x07ffffff; |
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if (!dist) |
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os->pflags |= AV_PKT_FLAG_KEY; |
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if (dts) |
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*dts = pts; |
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return pts; |
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}
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static int vp8_packet(AVFormatContext *s, int idx) |
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{
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struct ogg *ogg = s->priv_data; |
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struct ogg_stream *os = ogg->streams + idx; |
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uint8_t *p = os->buf + os->pstart; |
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if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && |
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!(os->flags & OGG_FLAG_EOS)) { |
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int seg; |
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int duration; |
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uint8_t *last_pkt = p; |
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uint8_t *next_pkt; |
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seg = os->segp; |
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duration = (last_pkt[0] >> 4) & 1; |
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next_pkt = last_pkt += os->psize; |
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for (; seg < os->nsegs; seg++) { |
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if (os->segments[seg] < 255) { |
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duration += (last_pkt[0] >> 4) & 1; |
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last_pkt = next_pkt + os->segments[seg]; |
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}
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next_pkt += os->segments[seg]; |
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}
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os->lastpts = |
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os->lastdts = vp8_gptopts(s, idx, os->granule, NULL) - duration; |
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if(s->streams[idx]->start_time == AV_NOPTS_VALUE) { |
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s->streams[idx]->start_time = os->lastpts; |
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if (s->streams[idx]->duration) |
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s->streams[idx]->duration -= s->streams[idx]->start_time; |
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}
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}
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if (os->psize > 0) |
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os->pduration = (p[0] >> 4) & 1; |
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return 0; |
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}
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const struct ogg_codec ff_vp8_codec = { |
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.magic = "OVP80", |
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.magicsize = 5, |
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.header = vp8_header, |
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.packet = vp8_packet, |
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.gptopts = vp8_gptopts, |
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.nb_header = 1, |
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};
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