avformat/rtpdec_ac3: add AC3 RTP depacketization (RFC 4184)
Signed-off-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> Reviewed-by: Thomas Volkert <silvo@gmx.net> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Gilles Chanteperdrix
Michael Niedermayer
parent
22470510d1
commit
3eec775b21
@ -24,6 +24,7 @@ version <next>:
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- ported softpulldown filter from libmpcodecs as repeatfields filter
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- dcshift filter
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- RTP parser for loss tolerant payload format for MP3 audio (RFC 5219)
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- RTP parser for AC3 payload format (RFC 4184)
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version 2.5:
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@ -465,6 +465,7 @@ Muxers/Demuxers:
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rmdec.c, rmenc.c Ronald S. Bultje, Kostya Shishkov
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rtmp* Kostya Shishkov
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rtp.c, rtpenc.c Martin Storsjo
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rtpdec_ac3.* Gilles Chanteperdrix
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rtpdec_h261.*, rtpenc_h261.* Thomas Volkert
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rtpdec_hevc.*, rtpenc_hevc.* Thomas Volkert
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rtpdec_asf.* Ronald S. Bultje
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@ -29,6 +29,7 @@ OBJS-$(CONFIG_RIFFENC) += riffenc.o
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OBJS-$(CONFIG_RTPDEC) += rdt.o \
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rtp.o \
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rtpdec.o \
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rtpdec_ac3.o \
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rtpdec_amr.o \
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rtpdec_asf.o \
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rtpdec_g726.o \
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@ -72,6 +72,7 @@ void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler)
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void ff_register_rtp_dynamic_payload_handlers(void)
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{
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ff_register_dynamic_payload_handler(&ff_ac3_dynamic_handler);
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ff_register_dynamic_payload_handler(&ff_amr_nb_dynamic_handler);
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ff_register_dynamic_payload_handler(&ff_amr_wb_dynamic_handler);
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ff_register_dynamic_payload_handler(&ff_g726_16_dynamic_handler);
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157
libavformat/rtpdec_ac3.c
Normal file
157
libavformat/rtpdec_ac3.c
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@ -0,0 +1,157 @@
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/*
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* RTP parser for AC3 payload format (RFC 4184)
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* Copyright (c) 2015 Gilles Chanteperdrix <gch@xenomai.org>
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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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#include "avformat.h"
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#include "rtpdec_formats.h"
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#define RTP_AC3_PAYLOAD_HEADER_SIZE 2
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struct PayloadContext {
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unsigned nr_frames;
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unsigned last_frame;
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uint32_t timestamp;
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AVIOContext *fragment;
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};
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static av_cold int ac3_init(AVFormatContext *s, int st_index,
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PayloadContext *data)
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{
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if (st_index < 0)
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return 0;
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s->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
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return 0;
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}
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static PayloadContext *ac3_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 inline void free_fragment_if_needed(PayloadContext *data)
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{
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if (data->fragment) {
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uint8_t *p;
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avio_close_dyn_buf(data->fragment, &p);
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av_free(p);
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data->fragment = NULL;
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}
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}
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static void ac3_free_context(PayloadContext *data)
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{
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free_fragment_if_needed(data);
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av_free(data);
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}
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static int ac3_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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unsigned frame_type;
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unsigned nr_frames;
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int err;
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if (len < RTP_AC3_PAYLOAD_HEADER_SIZE + 1) {
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av_log(ctx, AV_LOG_ERROR, "Invalid %d bytes packet\n", len);
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return AVERROR_INVALIDDATA;
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}
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frame_type = buf[0] & 0x3;
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nr_frames = buf[1];
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buf += RTP_AC3_PAYLOAD_HEADER_SIZE;
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len -= RTP_AC3_PAYLOAD_HEADER_SIZE;
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switch (frame_type) {
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case 0: /* One or more complete frames */
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if (!nr_frames) {
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av_log(ctx, AV_LOG_ERROR, "Invalid AC3 packet data\n");
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return AVERROR_INVALIDDATA;
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}
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if (av_new_packet(pkt, len)) {
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av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
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return AVERROR(ENOMEM);
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}
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pkt->stream_index = st->index;
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memcpy(pkt->data, buf, len);
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return 0;
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case 1:
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case 2: /* First fragment */
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free_fragment_if_needed(data);
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data->last_frame = 1;
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data->nr_frames = nr_frames;
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err = avio_open_dyn_buf(&data->fragment);
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if (err < 0)
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return err;
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avio_write(data->fragment, buf, len);
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data->timestamp = *timestamp;
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return AVERROR(EAGAIN);
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case 3: /* Fragment other than first */
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if (!data->fragment) {
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av_log(ctx, AV_LOG_WARNING,
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"Received packet without a start fragment; dropping.\n");
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return AVERROR(EAGAIN);
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}
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if (nr_frames != data->nr_frames ||
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data->timestamp != *timestamp) {
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free_fragment_if_needed(data);
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av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n");
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return AVERROR_INVALIDDATA;
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}
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avio_write(data->fragment, buf, len);
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data->last_frame++;
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}
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if (!(flags & RTP_FLAG_MARKER))
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return AVERROR(EAGAIN);
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if (data->last_frame != data->nr_frames) {
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free_fragment_if_needed(data);
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av_log(ctx, AV_LOG_ERROR, "Missed %d packets\n",
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data->nr_frames - data->last_frame);
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return AVERROR_INVALIDDATA;
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}
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err = ff_rtp_finalize_packet(pkt, &data->fragment, st->index);
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if (err < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Error occurred when getting fragment buffer.");
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return err;
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}
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return 0;
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}
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RTPDynamicProtocolHandler ff_ac3_dynamic_handler = {
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.enc_name = "ac3",
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.codec_type = AVMEDIA_TYPE_AUDIO,
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.codec_id = AV_CODEC_ID_AC3,
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.init = ac3_init,
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.alloc = ac3_new_context,
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.free = ac3_free_context,
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.parse_packet = ac3_handle_packet,
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};
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@ -35,6 +35,7 @@ int ff_h263_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, int flags);
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extern RTPDynamicProtocolHandler ff_ac3_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_amr_nb_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_amr_wb_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_g726_16_dynamic_handler;
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@ -30,7 +30,7 @@
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#include "libavutil/version.h"
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#define LIBAVFORMAT_VERSION_MAJOR 56
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#define LIBAVFORMAT_VERSION_MINOR 20
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#define LIBAVFORMAT_VERSION_MINOR 21
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#define LIBAVFORMAT_VERSION_MICRO 100
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#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
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