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https://github.com/FFmpeg/FFmpeg.git
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109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/*
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* RTP MPEG2TS depacketizer
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/attributes.h"
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#include "mpegts.h"
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#include "rtpdec_formats.h"
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struct PayloadContext {
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struct MpegTSContext *ts;
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int read_buf_index;
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int read_buf_size;
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uint8_t buf[RTP_MAX_PACKET_LENGTH];
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};
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static PayloadContext *mpegts_new_context(void)
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{
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return av_mallocz(sizeof(PayloadContext));
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}
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static void mpegts_free_context(PayloadContext *data)
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{
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if (!data)
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return;
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if (data->ts)
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ff_mpegts_parse_close(data->ts);
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av_free(data);
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}
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static av_cold int mpegts_init(AVFormatContext *ctx, int st_index,
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PayloadContext *data)
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{
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data->ts = ff_mpegts_parse_open(ctx);
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if (!data->ts)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int mpegts_handle_packet(AVFormatContext *ctx, PayloadContext *data,
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AVStream *st, AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, uint16_t seq,
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int flags)
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{
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int ret;
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// We don't want to use the RTP timestamps at all. If the mpegts demuxer
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// doesn't set any pts/dts, the generic rtpdec code shouldn't try to
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// fill it in either, since the mpegts and RTP timestamps are in totally
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// different ranges.
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*timestamp = RTP_NOTS_VALUE;
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if (!data->ts)
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return AVERROR(EINVAL);
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if (!buf) {
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if (data->read_buf_index >= data->read_buf_size)
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return AVERROR(EAGAIN);
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ret = ff_mpegts_parse_packet(data->ts, pkt, data->buf + data->read_buf_index,
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data->read_buf_size - data->read_buf_index);
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if (ret < 0)
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return AVERROR(EAGAIN);
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data->read_buf_index += ret;
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if (data->read_buf_index < data->read_buf_size)
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return 1;
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else
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return 0;
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}
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ret = ff_mpegts_parse_packet(data->ts, pkt, buf, len);
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/* The only error that can be returned from ff_mpegts_parse_packet
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* is "no more data to return from the provided buffer", so return
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* AVERROR(EAGAIN) for all errors */
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if (ret < 0)
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return AVERROR(EAGAIN);
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if (ret < len) {
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data->read_buf_size = FFMIN(len - ret, sizeof(data->buf));
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memcpy(data->buf, buf + ret, data->read_buf_size);
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data->read_buf_index = 0;
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return 1;
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}
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return 0;
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}
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RTPDynamicProtocolHandler ff_mpegts_dynamic_handler = {
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.codec_type = AVMEDIA_TYPE_DATA,
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.parse_packet = mpegts_handle_packet,
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.alloc = mpegts_new_context,
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.init = mpegts_init,
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.free = mpegts_free_context,
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.static_payload_id = 33,
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};
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