mirror of https://github.com/FFmpeg/FFmpeg.git
Nicolas George
13 years ago
parent
bf8ce5a5c3
commit
e62fd6619f
6 changed files with 140 additions and 1 deletions
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/*
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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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