136 lines
4.4 KiB
C
136 lines
4.4 KiB
C
/*
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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_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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uint8_t *extradata;
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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->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_OPUS;
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st->codec->channels = AV_RL8 (packet + 9);
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priv->pre_skip = AV_RL16(packet + 10);
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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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extradata = av_malloc(os->psize + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!extradata)
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return AVERROR(ENOMEM);
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memcpy(extradata, packet, os->psize);
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st->codec->extradata = extradata;
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st->codec->extradata_size = os->psize;
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st->codec->sample_rate = 48000;
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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_comment(avf, &st->metadata, 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_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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unsigned toc, toc_config, toc_count, frame_size, nb_frames = 1;
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if (!os->psize)
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return AVERROR_INVALIDDATA;
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toc = *packet;
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toc_config = toc >> 3;
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toc_count = toc & 3;
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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 (os->psize < 2)
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return AVERROR_INVALIDDATA;
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nb_frames = packet[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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os->pduration = frame_size * nb_frames;
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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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av_log(avf, AV_LOG_WARNING,
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"Last packet must be truncated to %d (unimplemented).\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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};
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