mirror of
https://github.com/FFmpeg/FFmpeg.git
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129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/*
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Copyright (C) 2008 Reimar Döffinger
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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**/
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#include <stdlib.h>
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#include "libavutil/bswap.h"
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#include "libavutil/avstring.h"
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#include "libavcodec/get_bits.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "oggdec.h"
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struct speex_params {
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int final_packet_duration;
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int seq;
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};
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static int speex_header(AVFormatContext *s, int idx) {
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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struct speex_params *spxp = os->private;
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AVStream *st = s->streams[idx];
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uint8_t *p = os->buf + os->pstart;
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if (!spxp) {
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spxp = av_mallocz(sizeof(*spxp));
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os->private = spxp;
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}
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if (spxp->seq > 1)
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return 0;
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if (spxp->seq == 0) {
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int frames_per_packet;
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_SPEEX;
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st->codec->sample_rate = AV_RL32(p + 36);
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st->codec->channels = AV_RL32(p + 48);
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/* We treat the whole Speex packet as a single frame everywhere Speex
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is handled in FFmpeg. This avoids the complexities of splitting
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and joining individual Speex frames, which are not always
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byte-aligned. */
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st->codec->frame_size = AV_RL32(p + 56);
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frames_per_packet = AV_RL32(p + 64);
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if (frames_per_packet)
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st->codec->frame_size *= frames_per_packet;
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st->codec->extradata_size = os->psize;
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st->codec->extradata = av_malloc(st->codec->extradata_size
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+ FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(st->codec->extradata, p, st->codec->extradata_size);
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st->time_base.num = 1;
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st->time_base.den = st->codec->sample_rate;
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} else
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ff_vorbis_comment(s, &st->metadata, p, os->psize);
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spxp->seq++;
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return 1;
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}
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static int ogg_page_packets(struct ogg_stream *os)
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{
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int i;
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int packets = 0;
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for (i = 0; i < os->nsegs; i++)
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if (os->segments[i] < 255)
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packets++;
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return packets;
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}
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static int speex_packet(AVFormatContext *s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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struct speex_params *spxp = os->private;
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int packet_size = s->streams[idx]->codec->frame_size;
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if (os->flags & OGG_FLAG_EOS && os->lastpts != AV_NOPTS_VALUE &&
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os->granule > 0) {
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/* first packet of final page. we have to calculate the final packet
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duration here because it is the only place we know the next-to-last
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granule position. */
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spxp->final_packet_duration = os->granule - os->lastpts -
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packet_size * (ogg_page_packets(os) - 1);
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}
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if (!os->lastpts && os->granule > 0)
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/* first packet */
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os->pduration = os->granule - packet_size * (ogg_page_packets(os) - 1);
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else if (os->flags & OGG_FLAG_EOS && os->segp == os->nsegs &&
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spxp->final_packet_duration)
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/* final packet */
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os->pduration = spxp->final_packet_duration;
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else
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os->pduration = packet_size;
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return 0;
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}
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const struct ogg_codec ff_speex_codec = {
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.magic = "Speex ",
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.magicsize = 8,
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.header = speex_header,
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.packet = speex_packet
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};
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