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ffmpeg / libavformat / oggparsespeex.c @ 8f8320d7

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/*
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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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        vorbis_comment(s, 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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};