| 0,0 → 1,140 |
|---|
| /* |
| * Opus parser for Ogg |
| * Copyright (c) 2012 Nicolas George |
| * |
| * 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 <string.h> |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "oggdec.h" |
| |
| struct oggopus_private { |
| int need_comments; |
| unsigned pre_skip; |
| int64_t cur_dts; |
| }; |
| |
| #define OPUS_HEAD_SIZE 19 |
| |
| static int opus_header(AVFormatContext *avf, int idx) |
| { |
| struct ogg *ogg = avf->priv_data; |
| struct ogg_stream *os = &ogg->streams[idx]; |
| AVStream *st = avf->streams[idx]; |
| struct oggopus_private *priv = os->private; |
| uint8_t *packet = os->buf + os->pstart; |
| |
| if (!priv) { |
| priv = os->private = av_mallocz(sizeof(*priv)); |
| if (!priv) |
| return AVERROR(ENOMEM); |
| } |
| |
| if (os->flags & OGG_FLAG_BOS) { |
| if (os->psize < OPUS_HEAD_SIZE || (AV_RL8(packet + 8) & 0xF0) != 0) |
| return AVERROR_INVALIDDATA; |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = AV_CODEC_ID_OPUS; |
| st->codec->channels = AV_RL8 (packet + 9); |
| priv->pre_skip = AV_RL16(packet + 10); |
| /*orig_sample_rate = AV_RL32(packet + 12);*/ |
| /*gain = AV_RL16(packet + 16);*/ |
| /*channel_map = AV_RL8 (packet + 18);*/ |
| |
| if (ff_alloc_extradata(st->codec, os->psize)) |
| return AVERROR(ENOMEM); |
| |
| memcpy(st->codec->extradata, packet, os->psize); |
| |
| st->codec->sample_rate = 48000; |
| avpriv_set_pts_info(st, 64, 1, 48000); |
| priv->need_comments = 1; |
| return 1; |
| } |
| |
| if (priv->need_comments) { |
| if (os->psize < 8 || memcmp(packet, "OpusTags", 8)) |
| return AVERROR_INVALIDDATA; |
| ff_vorbis_comment(avf, &st->metadata, packet + 8, os->psize - 8); |
| priv->need_comments--; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int opus_packet(AVFormatContext *avf, int idx) |
| { |
| struct ogg *ogg = avf->priv_data; |
| struct ogg_stream *os = &ogg->streams[idx]; |
| AVStream *st = avf->streams[idx]; |
| struct oggopus_private *priv = os->private; |
| uint8_t *packet = os->buf + os->pstart; |
| unsigned toc, toc_config, toc_count, frame_size, nb_frames = 1; |
| |
| if (!os->psize) |
| return AVERROR_INVALIDDATA; |
| |
| toc = *packet; |
| toc_config = toc >> 3; |
| toc_count = toc & 3; |
| frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) : |
| toc_config < 16 ? 480 << (toc_config & 1) : |
| 120 << (toc_config & 3); |
| if (toc_count == 3) { |
| if (os->psize < 2) |
| return AVERROR_INVALIDDATA; |
| nb_frames = packet[1] & 0x3F; |
| } else if (toc_count) { |
| nb_frames = 2; |
| } |
| |
| os->pduration = frame_size * nb_frames; |
| if (os->lastpts != AV_NOPTS_VALUE) { |
| if (st->start_time == AV_NOPTS_VALUE) |
| st->start_time = os->lastpts; |
| priv->cur_dts = os->lastdts = os->lastpts -= priv->pre_skip; |
| } |
| |
| priv->cur_dts += os->pduration; |
| if ((os->flags & OGG_FLAG_EOS)) { |
| int64_t skip = priv->cur_dts - os->granule + priv->pre_skip; |
| skip = FFMIN(skip, os->pduration); |
| if (skip > 0) { |
| os->pduration = skip < os->pduration ? os->pduration - skip : 1; |
| os->end_trimming = skip; |
| av_log(avf, AV_LOG_DEBUG, |
| "Last packet was truncated to %d due to end trimming.\n", |
| os->pduration); |
| } |
| } |
| |
| return 0; |
| } |
| |
| const struct ogg_codec ff_opus_codec = { |
| .name = "Opus", |
| .magic = "OpusHead", |
| .magicsize = 8, |
| .header = opus_header, |
| .packet = opus_packet, |
| .nb_header = 1, |
| }; |