yading@11: /*
yading@11:  * Opus parser for Ogg
yading@11:  * Copyright (c) 2012 Nicolas George
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include <string.h>
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "oggdec.h"
yading@11: 
yading@11: struct oggopus_private {
yading@11:     int need_comments;
yading@11:     unsigned pre_skip;
yading@11:     int64_t cur_dts;
yading@11: };
yading@11: 
yading@11: #define OPUS_HEAD_SIZE 19
yading@11: 
yading@11: static int opus_header(AVFormatContext *avf, int idx)
yading@11: {
yading@11:     struct ogg *ogg = avf->priv_data;
yading@11:     struct ogg_stream *os = &ogg->streams[idx];
yading@11:     AVStream *st = avf->streams[idx];
yading@11:     struct oggopus_private *priv = os->private;
yading@11:     uint8_t *packet = os->buf + os->pstart;
yading@11:     uint8_t *extradata;
yading@11: 
yading@11:     if (!priv) {
yading@11:         priv = os->private = av_mallocz(sizeof(*priv));
yading@11:         if (!priv)
yading@11:             return AVERROR(ENOMEM);
yading@11:     }
yading@11:     if (os->flags & OGG_FLAG_BOS) {
yading@11:         if (os->psize < OPUS_HEAD_SIZE || (AV_RL8(packet + 8) & 0xF0) != 0)
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:         st->codec->codec_id    = AV_CODEC_ID_OPUS;
yading@11:         st->codec->channels    = AV_RL8 (packet + 9);
yading@11:         priv->pre_skip         = AV_RL16(packet + 10);
yading@11:         /*orig_sample_rate     = AV_RL32(packet + 12);*/
yading@11:         /*gain                 = AV_RL16(packet + 16);*/
yading@11:         /*channel_map          = AV_RL8 (packet + 18);*/
yading@11: 
yading@11:         extradata = av_malloc(os->psize + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:         if (!extradata)
yading@11:             return AVERROR(ENOMEM);
yading@11:         memcpy(extradata, packet, os->psize);
yading@11:         st->codec->extradata = extradata;
yading@11:         st->codec->extradata_size = os->psize;
yading@11: 
yading@11:         st->codec->sample_rate = 48000;
yading@11:         avpriv_set_pts_info(st, 64, 1, 48000);
yading@11:         priv->need_comments = 1;
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     if (priv->need_comments) {
yading@11:         if (os->psize < 8 || memcmp(packet, "OpusTags", 8))
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         ff_vorbis_comment(avf, &st->metadata, packet + 8, os->psize - 8);
yading@11:         priv->need_comments--;
yading@11:         return 1;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int opus_packet(AVFormatContext *avf, int idx)
yading@11: {
yading@11:     struct ogg *ogg = avf->priv_data;
yading@11:     struct ogg_stream *os = &ogg->streams[idx];
yading@11:     AVStream *st = avf->streams[idx];
yading@11:     struct oggopus_private *priv = os->private;
yading@11:     uint8_t *packet = os->buf + os->pstart;
yading@11:     unsigned toc, toc_config, toc_count, frame_size, nb_frames = 1;
yading@11: 
yading@11:     if (!os->psize)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     toc = *packet;
yading@11:     toc_config = toc >> 3;
yading@11:     toc_count  = toc & 3;
yading@11:     frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) :
yading@11:                  toc_config < 16 ? 480 << (toc_config & 1) :
yading@11:                                    120 << (toc_config & 3);
yading@11:     if (toc_count == 3) {
yading@11:         if (os->psize < 2)
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         nb_frames = packet[1] & 0x3F;
yading@11:     } else if (toc_count) {
yading@11:         nb_frames = 2;
yading@11:     }
yading@11:     os->pduration = frame_size * nb_frames;
yading@11:     if (os->lastpts != AV_NOPTS_VALUE) {
yading@11:         if (st->start_time == AV_NOPTS_VALUE)
yading@11:             st->start_time = os->lastpts;
yading@11:         priv->cur_dts = os->lastdts = os->lastpts -= priv->pre_skip;
yading@11:     }
yading@11:     priv->cur_dts += os->pduration;
yading@11:     if ((os->flags & OGG_FLAG_EOS)) {
yading@11:         int64_t skip = priv->cur_dts - os->granule + priv->pre_skip;
yading@11:         skip = FFMIN(skip, os->pduration);
yading@11:         if (skip > 0) {
yading@11:             os->pduration = skip < os->pduration ? os->pduration - skip : 1;
yading@11:             av_log(avf, AV_LOG_WARNING,
yading@11:                    "Last packet must be truncated to %d (unimplemented).\n",
yading@11:                    os->pduration);
yading@11:         }
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: const struct ogg_codec ff_opus_codec = {
yading@11:     .name      = "Opus",
yading@11:     .magic     = "OpusHead",
yading@11:     .magicsize = 8,
yading@11:     .header    = opus_header,
yading@11:     .packet    = opus_packet,
yading@11: };