mirror of
https://github.com/pineappleEA/pineapple-src.git
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189 lines
6.0 KiB
C
Executable File
189 lines
6.0 KiB
C
Executable File
/*
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* Opus parser for Ogg
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* Copyright (c) 2012 Nicolas George
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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 <string.h>
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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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struct oggopus_private {
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int need_comments;
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unsigned pre_skip;
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int64_t cur_dts;
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};
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#define OPUS_SEEK_PREROLL_MS 80
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#define OPUS_HEAD_SIZE 19
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static int opus_header(AVFormatContext *avf, int idx)
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{
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struct ogg *ogg = avf->priv_data;
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struct ogg_stream *os = &ogg->streams[idx];
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AVStream *st = avf->streams[idx];
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struct oggopus_private *priv = os->private;
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uint8_t *packet = os->buf + os->pstart;
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int ret;
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if (!priv) {
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priv = os->private = av_mallocz(sizeof(*priv));
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if (!priv)
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return AVERROR(ENOMEM);
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}
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if (os->flags & OGG_FLAG_BOS) {
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if (os->psize < OPUS_HEAD_SIZE || (AV_RL8(packet + 8) & 0xF0) != 0)
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return AVERROR_INVALIDDATA;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_OPUS;
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st->codecpar->channels = AV_RL8(packet + 9);
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priv->pre_skip = AV_RL16(packet + 10);
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st->codecpar->initial_padding = priv->pre_skip;
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os->start_trimming = priv->pre_skip;
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/*orig_sample_rate = AV_RL32(packet + 12);*/
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/*gain = AV_RL16(packet + 16);*/
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/*channel_map = AV_RL8 (packet + 18);*/
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if ((ret = ff_alloc_extradata(st->codecpar, os->psize)) < 0)
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return ret;
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memcpy(st->codecpar->extradata, packet, os->psize);
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st->codecpar->sample_rate = 48000;
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st->codecpar->seek_preroll = av_rescale(OPUS_SEEK_PREROLL_MS,
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st->codecpar->sample_rate, 1000);
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avpriv_set_pts_info(st, 64, 1, 48000);
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priv->need_comments = 1;
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return 1;
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}
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if (priv->need_comments) {
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if (os->psize < 8 || memcmp(packet, "OpusTags", 8))
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return AVERROR_INVALIDDATA;
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ff_vorbis_stream_comment(avf, st, packet + 8, os->psize - 8);
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priv->need_comments--;
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return 1;
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}
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return 0;
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}
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static int opus_duration(uint8_t *src, int size)
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{
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unsigned nb_frames = 1;
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unsigned toc = src[0];
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unsigned toc_config = toc >> 3;
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unsigned toc_count = toc & 3;
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unsigned frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) :
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toc_config < 16 ? 480 << (toc_config & 1) :
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120 << (toc_config & 3);
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if (toc_count == 3) {
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if (size<2)
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return AVERROR_INVALIDDATA;
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nb_frames = src[1] & 0x3F;
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} else if (toc_count) {
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nb_frames = 2;
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}
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return frame_size * nb_frames;
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}
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static int opus_packet(AVFormatContext *avf, int idx)
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{
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struct ogg *ogg = avf->priv_data;
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struct ogg_stream *os = &ogg->streams[idx];
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AVStream *st = avf->streams[idx];
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struct oggopus_private *priv = os->private;
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uint8_t *packet = os->buf + os->pstart;
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int ret;
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if (!os->psize)
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return AVERROR_INVALIDDATA;
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if (os->granule > (1LL << 62)) {
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av_log(avf, AV_LOG_ERROR, "Unsupported huge granule pos %"PRId64 "\n", os->granule);
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return AVERROR_INVALIDDATA;
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}
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if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
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int seg, d;
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int duration;
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uint8_t *last_pkt = os->buf + os->pstart;
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uint8_t *next_pkt = last_pkt;
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duration = 0;
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seg = os->segp;
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d = opus_duration(last_pkt, os->psize);
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if (d < 0) {
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os->pflags |= AV_PKT_FLAG_CORRUPT;
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return 0;
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}
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duration += d;
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last_pkt = next_pkt = next_pkt + os->psize;
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for (; seg < os->nsegs; seg++) {
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next_pkt += os->segments[seg];
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if (os->segments[seg] < 255 && next_pkt != last_pkt) {
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int d = opus_duration(last_pkt, next_pkt - last_pkt);
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if (d > 0)
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duration += d;
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last_pkt = next_pkt;
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}
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}
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os->lastpts =
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os->lastdts = os->granule - duration;
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}
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if ((ret = opus_duration(packet, os->psize)) < 0)
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return ret;
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os->pduration = ret;
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if (os->lastpts != AV_NOPTS_VALUE) {
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if (st->start_time == AV_NOPTS_VALUE)
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st->start_time = os->lastpts;
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priv->cur_dts = os->lastdts = os->lastpts -= priv->pre_skip;
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}
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priv->cur_dts += os->pduration;
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if ((os->flags & OGG_FLAG_EOS)) {
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int64_t skip = priv->cur_dts - os->granule + priv->pre_skip;
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skip = FFMIN(skip, os->pduration);
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if (skip > 0) {
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os->pduration = skip < os->pduration ? os->pduration - skip : 1;
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os->end_trimming = skip;
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av_log(avf, AV_LOG_DEBUG,
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"Last packet was truncated to %d due to end trimming.\n",
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os->pduration);
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}
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}
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return 0;
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}
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const struct ogg_codec ff_opus_codec = {
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.name = "Opus",
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.magic = "OpusHead",
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.magicsize = 8,
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.header = opus_header,
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.packet = opus_packet,
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.nb_header = 1,
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};
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