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RTP/AMR depacketizer, by Martin Storsjö <$firstname at $firstname dot st>.
Originally committed as revision 21740 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
parent
1edea057dd
commit
556aa7a102
@ -56,6 +56,7 @@ version <next>:
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- IFF PBM/ILBM bitmap decoder
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- concat protocol
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- Indeo 5 decoder
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- RTP depacketization of AMR
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@ -214,6 +214,7 @@ OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o \
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rdt.o \
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rtp.o \
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rtpdec.o \
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rtpdec_amr.o \
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rtpdec_h263.o \
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rtp_asf.o \
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rtp_h264.o \
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@ -22,7 +22,7 @@
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#define AVFORMAT_AVFORMAT_H
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#define LIBAVFORMAT_VERSION_MAJOR 52
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#define LIBAVFORMAT_VERSION_MINOR 51
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#define LIBAVFORMAT_VERSION_MINOR 52
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#define LIBAVFORMAT_VERSION_MICRO 0
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#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
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@ -33,6 +33,7 @@
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#include "rtp_asf.h"
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#include "rtp_h264.h"
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#include "rtp_vorbis.h"
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#include "rtpdec_amr.h"
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#include "rtpdec_h263.h"
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//#define DEBUG
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@ -62,6 +63,8 @@ void av_register_rtp_dynamic_payload_handlers(void)
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{
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ff_register_dynamic_payload_handler(&mp4v_es_handler);
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ff_register_dynamic_payload_handler(&mpeg4_generic_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_h263_1998_dynamic_handler);
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ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
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ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
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177
libavformat/rtpdec_amr.c
Normal file
177
libavformat/rtpdec_amr.c
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@ -0,0 +1,177 @@
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/*
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* RTP AMR Depacketizer, RFC 3267
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* Copyright (c) 2010 Martin Storsjo
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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_amr.h"
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#include "libavutil/avstring.h"
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static const uint8_t frame_sizes_nb[16] = {
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12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0
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};
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static const uint8_t frame_sizes_wb[16] = {
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17, 23, 32, 36, 40, 46, 50, 58, 60, 5, 5, 0, 0, 0, 0, 0
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};
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static int amr_handle_packet(AVFormatContext *ctx,
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PayloadContext *data,
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AVStream *st,
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AVPacket * pkt,
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uint32_t * timestamp,
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const uint8_t * buf,
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int len, int flags)
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{
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const uint8_t *frame_sizes = NULL;
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int frames;
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int i;
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const uint8_t *speech_data;
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uint8_t *ptr;
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if (st->codec->codec_id == CODEC_ID_AMR_NB) {
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frame_sizes = frame_sizes_nb;
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} else if (st->codec->codec_id == CODEC_ID_AMR_WB) {
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frame_sizes = frame_sizes_wb;
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} else {
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av_log(ctx, AV_LOG_ERROR, "Bad codec ID\n");
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return AVERROR_INVALIDDATA;
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}
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if (st->codec->channels != 1) {
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av_log(ctx, AV_LOG_ERROR, "Only mono AMR is supported\n");
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return AVERROR_INVALIDDATA;
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}
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/* The AMR RTP packet consists of one header byte, followed
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* by one TOC byte for each AMR frame in the packet, followed
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* by the speech data for all the AMR frames.
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*
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* The header byte contains only a codec mode request, for
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* requesting what kind of AMR data the sender wants to
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* receive. Not used at the moment.
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*/
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/* Count the number of frames in the packet. The highest bit
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* is set in a TOC byte if there are more frames following.
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*/
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for (frames = 1; frames < len && (buf[frames] & 0x80); frames++) ;
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if (1 + frames >= len) {
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/* We hit the end of the packet while counting frames. */
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av_log(ctx, AV_LOG_ERROR, "No speech data found\n");
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return AVERROR_INVALIDDATA;
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}
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speech_data = buf + 1 + frames;
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/* Everything except the codec mode request byte should be output. */
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if (av_new_packet(pkt, len - 1)) {
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av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
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return AVERROR_NOMEM;
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}
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pkt->stream_index = st->index;
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ptr = pkt->data;
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for (i = 0; i < frames; i++) {
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uint8_t toc = buf[1 + i];
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int frame_size = frame_sizes[(toc >> 3) & 0x0f];
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if (speech_data + frame_size > buf + len) {
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/* Too little speech data */
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av_log(ctx, AV_LOG_WARNING, "Too little speech data in the RTP packet\n");
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/* Set the unwritten part of the packet to zero. */
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memset(ptr, 0, pkt->data + pkt->size - ptr);
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pkt->size = ptr - pkt->data;
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return 0;
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}
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/* Extract the AMR frame mode from the TOC byte */
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*ptr++ = toc & 0x7C;
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/* Copy the speech data */
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memcpy(ptr, speech_data, frame_size);
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speech_data += frame_size;
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ptr += frame_size;
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}
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if (speech_data < buf + len) {
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av_log(ctx, AV_LOG_WARNING, "Too much speech data in the RTP packet?\n");
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/* Set the unwritten part of the packet to zero. */
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memset(ptr, 0, pkt->data + pkt->size - ptr);
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pkt->size = ptr - pkt->data;
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}
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return 0;
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}
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static int amr_parse_sdp_line(AVFormatContext *s, int st_index,
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PayloadContext *data, const char *line)
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{
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const char *p;
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char attr[25], value[25];
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/* Parse an fmtp line this one:
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* a=fmtp:97 octet-align=1; interleaving=0
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* That is, a normal fmtp: line followed by semicolon & space
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* separated key/value pairs.
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*/
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if (av_strstart(line, "fmtp:", &p)) {
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int octet_align = 0;
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int crc = 0;
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int interleaving = 0;
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int channels = 1;
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while (*p && *p == ' ') p++; /* strip spaces */
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while (*p && *p != ' ') p++; /* eat protocol identifier */
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while (*p && *p == ' ') p++; /* strip trailing spaces */
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while (rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value))) {
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if (!strcmp(attr, "octet-align"))
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octet_align = atoi(value);
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else if (!strcmp(attr, "crc"))
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crc = atoi(value);
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else if (!strcmp(attr, "interleaving"))
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interleaving = atoi(value);
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else if (!strcmp(attr, "channels"))
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channels = atoi(value);
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}
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if (!octet_align || crc || interleaving || channels != 1) {
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av_log(s, AV_LOG_ERROR, "Unsupported RTP/AMR configuration!\n");
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return -1;
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}
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}
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return 0;
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}
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RTPDynamicProtocolHandler ff_amr_nb_dynamic_handler = {
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.enc_name = "AMR",
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.codec_type = CODEC_TYPE_AUDIO,
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.codec_id = CODEC_ID_AMR_NB,
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.parse_sdp_a_line = amr_parse_sdp_line,
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.parse_packet = amr_handle_packet,
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};
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RTPDynamicProtocolHandler ff_amr_wb_dynamic_handler = {
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.enc_name = "AMR-WB",
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.codec_type = CODEC_TYPE_AUDIO,
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.codec_id = CODEC_ID_AMR_WB,
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.parse_sdp_a_line = amr_parse_sdp_line,
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.parse_packet = amr_handle_packet,
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};
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30
libavformat/rtpdec_amr.h
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30
libavformat/rtpdec_amr.h
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@ -0,0 +1,30 @@
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/*
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* RTP AMR Depacketizer, RFC 3267
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* Copyright (c) 2010 Martin Storsjo
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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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#ifndef AVFORMAT_RTPDEC_AMR_H
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#define AVFORMAT_RTPDEC_AMR_H
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#include "rtpdec.h"
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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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#endif /* AVFORMAT_RTPDEC_AMR_H */
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