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![Michael Niedermayer](/assets/img/avatar_default.png)
* commit '0307cc2253e76772b1c645ac6117d08da87a147c': rtpdec: pass an AVFormatContext to ff_parse_fmtp() Merged-by: Michael Niedermayer <michaelni@gmx.at>
211 lines
6.7 KiB
C
211 lines
6.7 KiB
C
/*
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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 "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "rtpdec_formats.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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struct PayloadContext {
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int octet_align;
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int crc;
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int interleaving;
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int channels;
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};
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static PayloadContext *amr_new_context(void)
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{
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PayloadContext *data = av_mallocz(sizeof(PayloadContext));
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if(!data) return data;
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data->channels = 1;
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return data;
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}
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static void amr_free_context(PayloadContext *data)
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{
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av_free(data);
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}
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static int amr_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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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 == AV_CODEC_ID_AMR_NB) {
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frame_sizes = frame_sizes_nb;
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} else if (st->codec->codec_id == AV_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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st->codec->channel_layout = AV_CH_LAYOUT_MONO;
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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(ENOMEM);
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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_fmtp(AVFormatContext *s,
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AVStream *stream, PayloadContext *data,
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char *attr, char *value)
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{
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/* Some AMR SDP configurations contain "octet-align", without
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* the trailing =1. Therefore, if the value is empty,
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* interpret it as "1".
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*/
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if (!strcmp(value, "")) {
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av_log(s, AV_LOG_WARNING, "AMR fmtp attribute %s had "
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"nonstandard empty value\n", attr);
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strcpy(value, "1");
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}
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if (!strcmp(attr, "octet-align"))
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data->octet_align = atoi(value);
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else if (!strcmp(attr, "crc"))
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data->crc = atoi(value);
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else if (!strcmp(attr, "interleaving"))
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data->interleaving = atoi(value);
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else if (!strcmp(attr, "channels"))
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data->channels = atoi(value);
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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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int ret;
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if (st_index < 0)
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return 0;
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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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ret = ff_parse_fmtp(s, s->streams[st_index], data, p, amr_parse_fmtp);
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if (!data->octet_align || data->crc ||
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data->interleaving || data->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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return ret;
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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 = AVMEDIA_TYPE_AUDIO,
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.codec_id = AV_CODEC_ID_AMR_NB,
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.parse_sdp_a_line = amr_parse_sdp_line,
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.alloc = amr_new_context,
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.free = amr_free_context,
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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 = AVMEDIA_TYPE_AUDIO,
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.codec_id = AV_CODEC_ID_AMR_WB,
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.parse_sdp_a_line = amr_parse_sdp_line,
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.alloc = amr_new_context,
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.free = amr_free_context,
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.parse_packet = amr_handle_packet,
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};
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