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ffmpeg / libavformat / rtpdec_svq3.c @ 5590cc78

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/*
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 * Sorenson-3 (SVQ3/SV3V) payload for RTP
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 * Copyright (c) 2010 Ronald S. Bultje
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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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/**
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 * @file
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 * @brief RTP support for the SV3V (SVQ3) payload
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 * (http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization)
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 * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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 */
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#include <string.h>
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#include <libavcodec/get_bits.h>
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#include "rtp.h"
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#include "rtpdec.h"
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#include "rtpdec_svq3.h"
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struct PayloadContext {
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    ByteIOContext *pktbuf;
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    int64_t        timestamp;
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    int            is_keyframe;
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};
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/** return 0 on packet, <0 on partial packet or error... */
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static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
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                              AVStream *st, AVPacket *pkt,
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                              uint32_t *timestamp,
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                              const uint8_t *buf, int len, int flags)
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{
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    int config_packet, start_packet, end_packet;
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    if (len < 2)
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        return AVERROR_INVALIDDATA;
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    config_packet = buf[0] & 0x40;
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    start_packet  = buf[0] & 0x20;
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    end_packet    = buf[0] & 0x10;
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    buf += 2;     // ignore buf[1]
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    len -= 2;
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    if (config_packet) {
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        av_freep(&st->codec->extradata);
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        st->codec->extradata_size = 0;
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        if (len < 2 || !(st->codec->extradata =
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                         av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
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            return AVERROR_INVALIDDATA;
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        st->codec->extradata_size = len + 8;
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        memcpy(st->codec->extradata, "SEQH", 4);
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        AV_WB32(st->codec->extradata + 4, len);
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        memcpy(st->codec->extradata + 8, buf, len);
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        /* We set codec_id to CODEC_ID_NONE initially to
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         * delay decoder initialization since extradata is
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         * carried within the RTP stream, not SDP. Here,
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         * by setting codec_id to CODEC_ID_SVQ3, we are signalling
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         * to the decoder that it is OK to initialize. */
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        st->codec->codec_id = CODEC_ID_SVQ3;
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        return AVERROR(EAGAIN);
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    }
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    if (start_packet) {
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        int res;
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        if (sv->pktbuf) {
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            uint8_t *tmp;
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            url_close_dyn_buf(sv->pktbuf, &tmp);
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            av_free(tmp);
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        }
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        if ((res = url_open_dyn_buf(&sv->pktbuf)) < 0)
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            return res;
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        sv->timestamp   = *timestamp;
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        sv->is_keyframe = flags & RTP_FLAG_KEY;
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    }
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    if (!sv->pktbuf)
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        return AVERROR_INVALIDDATA;
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    put_buffer(sv->pktbuf, buf, len);
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    if (end_packet) {
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        av_init_packet(pkt);
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        pkt->stream_index = st->index;
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        *timestamp        = sv->timestamp;
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        pkt->flags        = sv->is_keyframe ? AV_PKT_FLAG_KEY : 0;
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        pkt->size         = url_close_dyn_buf(sv->pktbuf, &pkt->data);
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        pkt->destruct     = av_destruct_packet;
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        sv->pktbuf        = NULL;
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        return 0;
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    }
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    return AVERROR(EAGAIN);
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}
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static PayloadContext *svq3_extradata_new(void)
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{
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    return av_mallocz(sizeof(PayloadContext));
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}
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static void svq3_extradata_free(PayloadContext *sv)
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{
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    if (sv->pktbuf) {
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        uint8_t *buf;
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        url_close_dyn_buf(sv->pktbuf, &buf);
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        av_free(buf);
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    }
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    av_free(sv);
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}
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RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
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    "X-SV3V-ES",
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    CODEC_TYPE_VIDEO,
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    CODEC_ID_NONE,          // see if (config_packet) above
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    NULL,                   // parse sdp line
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    svq3_extradata_new,
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    svq3_extradata_free,
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    svq3_parse_packet,
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};