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078d43e23a
This is different from how it is handled in codecs/demuxers/muxers though (where the close function isn't called if the open function failed), but since the number of depacketizers that have an .init function is quite limited, this is easy to change. The main point is that if the init function failed, we shouldn't try to use that depacketizer at all - this makes sure that the parse function doesn't need to check for the things that were initialized in the init function. Signed-off-by: Martin Storsjö <martin@martin.st>
100 lines
3.3 KiB
C
100 lines
3.3 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 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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}
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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 (!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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.priv_data_size = sizeof(PayloadContext),
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.parse_packet = mpegts_handle_packet,
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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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