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/* |
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* Common code for the RTP depacketization of MPEG-4 formats.
* Copyright (c) 2010 Fabrice Bellard
* Romain Degez
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* @brief MPEG4 / RTP Code
* @author Fabrice Bellard
* @author Romain Degez
*/
|
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#include "rtpdec_formats.h" |
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#include "internal.h" |
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#include "libavutil/attributes.h" |
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#include "libavutil/avstring.h" |
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#include "libavcodec/get_bits.h" |
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|
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/** Structure listing useful vars to parse RTP packet payload */
struct PayloadContext { |
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int sizelength;
int indexlength;
int indexdeltalength;
int profile_level_id;
int streamtype;
int objecttype;
char *mode;
/** mpeg 4 AU headers */
struct AUHeaders {
int size;
int index;
int cts_flag;
int cts;
int dts_flag;
int dts;
int rap_flag;
int streamstate;
} *au_headers;
int au_headers_allocated;
int nb_au_headers;
int au_headers_length_bytes;
int cur_au_index; |
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uint8_t buf[RTP_MAX_PACKET_LENGTH];
int buf_pos, buf_size; |
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}; |
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|
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typedef struct {
const char *str;
uint16_t type;
uint32_t offset;
} AttrNameMap;
/* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
#define ATTR_NAME_TYPE_INT 0
#define ATTR_NAME_TYPE_STR 1 |
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static const AttrNameMap attr_names[] = { |
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{ "SizeLength", ATTR_NAME_TYPE_INT, |
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offsetof(PayloadContext, sizelength) }, |
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{ "IndexLength", ATTR_NAME_TYPE_INT, |
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offsetof(PayloadContext, indexlength) }, |
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{ "IndexDeltaLength", ATTR_NAME_TYPE_INT, |
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offsetof(PayloadContext, indexdeltalength) }, |
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{ "profile-level-id", ATTR_NAME_TYPE_INT, |
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offsetof(PayloadContext, profile_level_id) }, |
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{ "StreamType", ATTR_NAME_TYPE_INT, |
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offsetof(PayloadContext, streamtype) }, |
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{ "mode", ATTR_NAME_TYPE_STR, |
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offsetof(PayloadContext, mode) }, |
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{ NULL, -1, -1 },
};
|
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static PayloadContext *new_context(void)
{
return av_mallocz(sizeof(PayloadContext));
}
|
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static void free_context(PayloadContext *data) |
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{ |
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av_free(data->au_headers); |
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av_free(data->mode);
av_free(data);
}
|
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static int parse_fmtp_config(AVCodecContext *codec, char *value) |
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{
/* decode the hexa encoded parameter */ |
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int len = ff_hex_to_data(NULL, value); |
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av_free(codec->extradata); |
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if (ff_alloc_extradata(codec, len)) |
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return AVERROR(ENOMEM); |
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ff_hex_to_data(codec->extradata, value); |
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return 0;
}
|
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static int rtp_parse_mp4_au(PayloadContext *data, const uint8_t *buf, int len) |
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{
int au_headers_length, au_header_size, i;
GetBitContext getbitcontext;
|
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if (len < 2)
return AVERROR_INVALIDDATA;
|
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/* decode the first 2 bytes where the AUHeader sections are stored
length in bits */
au_headers_length = AV_RB16(buf);
if (au_headers_length > RTP_MAX_PACKET_LENGTH)
return -1;
|
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data->au_headers_length_bytes = (au_headers_length + 7) / 8; |
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/* skip AU headers length section (2 bytes) */
buf += 2; |
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len -= 2;
if (len < data->au_headers_length_bytes)
return AVERROR_INVALIDDATA; |
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|
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init_get_bits(&getbitcontext, buf, data->au_headers_length_bytes * 8); |
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|
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/* XXX: Wrong if optional additional sections are present (cts, dts etc...) */ |
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au_header_size = data->sizelength + data->indexlength; |
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if (au_header_size <= 0 || (au_headers_length % au_header_size != 0))
return -1;
|
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data->nb_au_headers = au_headers_length / au_header_size;
if (!data->au_headers || data->au_headers_allocated < data->nb_au_headers) {
av_free(data->au_headers);
data->au_headers = av_malloc(sizeof(struct AUHeaders) * data->nb_au_headers); |
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if (!data->au_headers)
return AVERROR(ENOMEM); |
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data->au_headers_allocated = data->nb_au_headers; |
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}
|
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for (i = 0; i < data->nb_au_headers; ++i) { |
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data->au_headers[i].size = get_bits_long(&getbitcontext, data->sizelength);
data->au_headers[i].index = get_bits_long(&getbitcontext, data->indexlength); |
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}
return 0;
}
/* Follows RFC 3640 */ |
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static int aac_parse_packet(AVFormatContext *ctx, PayloadContext *data,
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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{ |
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int ret; |
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if (!buf) {
if (data->cur_au_index > data->nb_au_headers)
return AVERROR_INVALIDDATA;
if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size)
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0)
return ret;
memcpy(pkt->data, &data->buf[data->buf_pos], data->au_headers[data->cur_au_index].size);
data->buf_pos += data->au_headers[data->cur_au_index].size;
pkt->stream_index = st->index;
data->cur_au_index++;
return data->cur_au_index < data->nb_au_headers;
}
|
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if (rtp_parse_mp4_au(data, buf, len)) |
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return -1;
|
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buf += data->au_headers_length_bytes + 2;
len -= data->au_headers_length_bytes + 2; |
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|
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if (len < data->au_headers[0].size)
return AVERROR_INVALIDDATA; |
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if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0)
return ret; |
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memcpy(pkt->data, buf, data->au_headers[0].size); |
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len -= data->au_headers[0].size;
buf += data->au_headers[0].size; |
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pkt->stream_index = st->index; |
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if (len > 0 && data->nb_au_headers > 1) {
data->buf_size = FFMIN(len, sizeof(data->buf));
memcpy(data->buf, buf, data->buf_size);
data->cur_au_index = 1;
data->buf_pos = 0;
return 1;
}
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return 0;
}
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static int parse_fmtp(AVStream *stream, PayloadContext *data,
char *attr, char *value) |
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{ |
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AVCodecContext *codec = stream->codec;
int res, i;
|
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if (!strcmp(attr, "config")) {
res = parse_fmtp_config(codec, value); |
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|
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if (res < 0)
return res;
} |
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|
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if (codec->codec_id == AV_CODEC_ID_AAC) { |
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/* Looking for a known attribute */
for (i = 0; attr_names[i].str; ++i) { |
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if (!av_strcasecmp(attr, attr_names[i].str)) { |
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if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
*(int *)((char *)data+
attr_names[i].offset) = atoi(value);
} else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
*(char **)((char *)data+
attr_names[i].offset) = av_strdup(value); |
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} |
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} |
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}
return 0;
} |
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|
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static int parse_sdp_line(AVFormatContext *s, int st_index,
PayloadContext *data, const char *line)
{
const char *p;
|
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if (st_index < 0)
return 0;
|
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if (av_strstart(line, "fmtp:", &p))
return ff_parse_fmtp(s->streams[st_index], data, p, parse_fmtp); |
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|
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return 0; |
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}
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static av_cold int init_video(AVFormatContext *s, int st_index,
PayloadContext *data) |
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{
if (st_index < 0)
return 0;
s->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
return 0;
}
|
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RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
.enc_name = "MP4V-ES",
.codec_type = AVMEDIA_TYPE_VIDEO, |
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.codec_id = AV_CODEC_ID_MPEG4, |
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.init = init_video, |
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.parse_sdp_a_line = parse_sdp_line,
};
RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
.enc_name = "mpeg4-generic",
.codec_type = AVMEDIA_TYPE_AUDIO, |
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.codec_id = AV_CODEC_ID_AAC, |
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.parse_sdp_a_line = parse_sdp_line, |
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.alloc = new_context,
.free = free_context, |
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.parse_packet = aac_parse_packet |
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}; |