mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
5c2ccf83df
* commit '7abd35a1ffaecfd79fa07b801621ee11ab595c43': avformat: Add av_cold attributes to init functions missing them Conflicts: libavformat/rtpdec_xiph.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
411 lines
13 KiB
C
411 lines
13 KiB
C
/*
|
|
* Xiph RTP Protocols
|
|
* Copyright (c) 2009 Colin McQuillian
|
|
* Copyright (c) 2010 Josh Allmann
|
|
*
|
|
* 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 Xiph / RTP Code
|
|
* @author Colin McQuillan <m.niloc@gmail.com>
|
|
* @author Josh Allmann <joshua.allmann@gmail.com>
|
|
*/
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/base64.h"
|
|
#include "libavcodec/bytestream.h"
|
|
|
|
#include "rtpdec.h"
|
|
#include "rtpdec_formats.h"
|
|
|
|
/**
|
|
* RTP/Xiph specific private data.
|
|
*/
|
|
struct PayloadContext {
|
|
unsigned ident; ///< 24-bit stream configuration identifier
|
|
uint32_t timestamp;
|
|
AVIOContext* fragment; ///< buffer for split payloads
|
|
uint8_t *split_buf;
|
|
int split_pos, split_buf_len, split_buf_size;
|
|
int split_pkts;
|
|
};
|
|
|
|
static PayloadContext *xiph_new_context(void)
|
|
{
|
|
return av_mallocz(sizeof(PayloadContext));
|
|
}
|
|
|
|
static inline void free_fragment_if_needed(PayloadContext * data)
|
|
{
|
|
if (data->fragment) {
|
|
uint8_t* p;
|
|
avio_close_dyn_buf(data->fragment, &p);
|
|
av_free(p);
|
|
data->fragment = NULL;
|
|
}
|
|
}
|
|
|
|
static void xiph_free_context(PayloadContext * data)
|
|
{
|
|
free_fragment_if_needed(data);
|
|
av_free(data->split_buf);
|
|
av_free(data);
|
|
}
|
|
|
|
static av_cold int xiph_vorbis_init(AVFormatContext *ctx, int st_index,
|
|
PayloadContext *data)
|
|
{
|
|
if (st_index < 0)
|
|
return 0;
|
|
ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_HEADERS;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int xiph_handle_packet(AVFormatContext *ctx, PayloadContext *data,
|
|
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
|
|
const uint8_t *buf, int len, uint16_t seq,
|
|
int flags)
|
|
{
|
|
|
|
int ident, fragmented, tdt, num_pkts, pkt_len;
|
|
|
|
if (!buf) {
|
|
if (!data->split_buf || data->split_pos + 2 > data->split_buf_len ||
|
|
data->split_pkts <= 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "No more data to return\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
pkt_len = AV_RB16(data->split_buf + data->split_pos);
|
|
data->split_pos += 2;
|
|
if (data->split_pos + pkt_len > data->split_buf_len) {
|
|
av_log(ctx, AV_LOG_ERROR, "Not enough data to return\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (av_new_packet(pkt, pkt_len)) {
|
|
av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
pkt->stream_index = st->index;
|
|
memcpy(pkt->data, data->split_buf + data->split_pos, pkt_len);
|
|
data->split_pos += pkt_len;
|
|
data->split_pkts--;
|
|
return data->split_pkts > 0;
|
|
}
|
|
|
|
if (len < 6) {
|
|
av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
// read xiph rtp headers
|
|
ident = AV_RB24(buf);
|
|
fragmented = buf[3] >> 6;
|
|
tdt = (buf[3] >> 4) & 3;
|
|
num_pkts = buf[3] & 0xf;
|
|
pkt_len = AV_RB16(buf + 4);
|
|
|
|
if (pkt_len > len - 6) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Invalid packet length %d in %d byte packet\n", pkt_len,
|
|
len);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (ident != data->ident) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Unimplemented Xiph SDP configuration change detected\n");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
if (tdt) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Unimplemented RTP Xiph packet settings (%d,%d,%d)\n",
|
|
fragmented, tdt, num_pkts);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
buf += 6; // move past header bits
|
|
len -= 6;
|
|
|
|
if (fragmented == 0) {
|
|
if (av_new_packet(pkt, pkt_len)) {
|
|
av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
pkt->stream_index = st->index;
|
|
memcpy(pkt->data, buf, pkt_len);
|
|
buf += pkt_len;
|
|
len -= pkt_len;
|
|
num_pkts--;
|
|
|
|
if (num_pkts > 0) {
|
|
if (len > data->split_buf_size || !data->split_buf) {
|
|
av_freep(&data->split_buf);
|
|
data->split_buf_size = 2 * len;
|
|
data->split_buf = av_malloc(data->split_buf_size);
|
|
if (!data->split_buf) {
|
|
av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
|
|
av_free_packet(pkt);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
}
|
|
memcpy(data->split_buf, buf, len);
|
|
data->split_buf_len = len;
|
|
data->split_pos = 0;
|
|
data->split_pkts = num_pkts;
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
} else if (fragmented == 1) {
|
|
// start of xiph data fragment
|
|
int res;
|
|
|
|
// end packet has been lost somewhere, so drop buffered data
|
|
free_fragment_if_needed(data);
|
|
|
|
if((res = avio_open_dyn_buf(&data->fragment)) < 0)
|
|
return res;
|
|
|
|
avio_write(data->fragment, buf, pkt_len);
|
|
data->timestamp = *timestamp;
|
|
|
|
} else {
|
|
av_assert1(fragmented < 4);
|
|
if (data->timestamp != *timestamp) {
|
|
// skip if fragmented timestamp is incorrect;
|
|
// a start packet has been lost somewhere
|
|
free_fragment_if_needed(data);
|
|
av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (!data->fragment) {
|
|
av_log(ctx, AV_LOG_WARNING,
|
|
"Received packet without a start fragment; dropping.\n");
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
// copy data to fragment buffer
|
|
avio_write(data->fragment, buf, pkt_len);
|
|
|
|
if (fragmented == 3) {
|
|
// end of xiph data packet
|
|
int ret = ff_rtp_finalize_packet(pkt, &data->fragment, st->index);
|
|
if (ret < 0) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Error occurred when getting fragment buffer.");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
/**
|
|
* Length encoding described in RFC5215 section 3.1.1.
|
|
*/
|
|
static int get_base128(const uint8_t ** buf, const uint8_t * buf_end)
|
|
{
|
|
int n = 0;
|
|
for (; *buf < buf_end; ++*buf) {
|
|
n <<= 7;
|
|
n += **buf & 0x7f;
|
|
if (!(**buf & 0x80)) {
|
|
++*buf;
|
|
return n;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Based off parse_packed_headers in Vorbis RTP
|
|
*/
|
|
static int
|
|
parse_packed_headers(const uint8_t * packed_headers,
|
|
const uint8_t * packed_headers_end,
|
|
AVCodecContext * codec, PayloadContext * xiph_data)
|
|
{
|
|
|
|
unsigned num_packed, num_headers, length, length1, length2, extradata_alloc;
|
|
uint8_t *ptr;
|
|
|
|
if (packed_headers_end - packed_headers < 9) {
|
|
av_log(codec, AV_LOG_ERROR,
|
|
"Invalid %td byte packed header.",
|
|
packed_headers_end - packed_headers);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
num_packed = bytestream_get_be32(&packed_headers);
|
|
xiph_data->ident = bytestream_get_be24(&packed_headers);
|
|
length = bytestream_get_be16(&packed_headers);
|
|
num_headers = get_base128(&packed_headers, packed_headers_end);
|
|
length1 = get_base128(&packed_headers, packed_headers_end);
|
|
length2 = get_base128(&packed_headers, packed_headers_end);
|
|
|
|
if (num_packed != 1 || num_headers > 3) {
|
|
av_log(codec, AV_LOG_ERROR,
|
|
"Unimplemented number of headers: %d packed headers, %d headers\n",
|
|
num_packed, num_headers);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
if (packed_headers_end - packed_headers != length ||
|
|
length1 > length || length2 > length - length1) {
|
|
av_log(codec, AV_LOG_ERROR,
|
|
"Bad packed header lengths (%d,%d,%td,%d)\n", length1,
|
|
length2, packed_headers_end - packed_headers, length);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* allocate extra space:
|
|
* -- length/255 +2 for xiphlacing
|
|
* -- one for the '2' marker
|
|
* -- FF_INPUT_BUFFER_PADDING_SIZE required */
|
|
extradata_alloc = length + length/255 + 3 + FF_INPUT_BUFFER_PADDING_SIZE;
|
|
|
|
ptr = codec->extradata = av_malloc(extradata_alloc);
|
|
if (!ptr) {
|
|
av_log(codec, AV_LOG_ERROR, "Out of memory\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
*ptr++ = 2;
|
|
ptr += av_xiphlacing(ptr, length1);
|
|
ptr += av_xiphlacing(ptr, length2);
|
|
memcpy(ptr, packed_headers, length);
|
|
ptr += length;
|
|
codec->extradata_size = ptr - codec->extradata;
|
|
// clear out remaining parts of the buffer
|
|
memset(ptr, 0, extradata_alloc - codec->extradata_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xiph_parse_fmtp_pair(AVStream* stream,
|
|
PayloadContext *xiph_data,
|
|
char *attr, char *value)
|
|
{
|
|
AVCodecContext *codec = stream->codec;
|
|
int result = 0;
|
|
|
|
if (!strcmp(attr, "sampling")) {
|
|
if (!strcmp(value, "YCbCr-4:2:0")) {
|
|
codec->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
} else if (!strcmp(value, "YCbCr-4:4:2")) {
|
|
codec->pix_fmt = AV_PIX_FMT_YUV422P;
|
|
} else if (!strcmp(value, "YCbCr-4:4:4")) {
|
|
codec->pix_fmt = AV_PIX_FMT_YUV444P;
|
|
} else {
|
|
av_log(codec, AV_LOG_ERROR,
|
|
"Unsupported pixel format %s\n", attr);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
} else if (!strcmp(attr, "width")) {
|
|
/* This is an integer between 1 and 1048561
|
|
* and MUST be in multiples of 16. */
|
|
codec->width = atoi(value);
|
|
return 0;
|
|
} else if (!strcmp(attr, "height")) {
|
|
/* This is an integer between 1 and 1048561
|
|
* and MUST be in multiples of 16. */
|
|
codec->height = atoi(value);
|
|
return 0;
|
|
} else if (!strcmp(attr, "delivery-method")) {
|
|
/* Possible values are: inline, in_band, out_band/specific_name. */
|
|
return AVERROR_PATCHWELCOME;
|
|
} else if (!strcmp(attr, "configuration-uri")) {
|
|
/* NOTE: configuration-uri is supported only under 2 conditions:
|
|
*--after the delivery-method tag
|
|
* --with a delivery-method value of out_band */
|
|
return AVERROR_PATCHWELCOME;
|
|
} else if (!strcmp(attr, "configuration")) {
|
|
/* NOTE: configuration is supported only AFTER the delivery-method tag
|
|
* The configuration value is a base64 encoded packed header */
|
|
uint8_t *decoded_packet = NULL;
|
|
int packet_size;
|
|
size_t decoded_alloc = strlen(value) / 4 * 3 + 4;
|
|
|
|
if (decoded_alloc <= INT_MAX) {
|
|
decoded_packet = av_malloc(decoded_alloc);
|
|
if (decoded_packet) {
|
|
packet_size =
|
|
av_base64_decode(decoded_packet, value, decoded_alloc);
|
|
|
|
result = parse_packed_headers
|
|
(decoded_packet, decoded_packet + packet_size, codec,
|
|
xiph_data);
|
|
} else {
|
|
av_log(codec, AV_LOG_ERROR,
|
|
"Out of memory while decoding SDP configuration.\n");
|
|
result = AVERROR(ENOMEM);
|
|
}
|
|
} else {
|
|
av_log(codec, AV_LOG_ERROR, "Packet too large\n");
|
|
result = AVERROR_INVALIDDATA;
|
|
}
|
|
av_free(decoded_packet);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static int xiph_parse_sdp_line(AVFormatContext *s, int st_index,
|
|
PayloadContext *data, const char *line)
|
|
{
|
|
const char *p;
|
|
|
|
if (st_index < 0)
|
|
return 0;
|
|
|
|
if (av_strstart(line, "fmtp:", &p)) {
|
|
return ff_parse_fmtp(s->streams[st_index], data, p,
|
|
xiph_parse_fmtp_pair);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
RTPDynamicProtocolHandler ff_theora_dynamic_handler = {
|
|
.enc_name = "theora",
|
|
.codec_type = AVMEDIA_TYPE_VIDEO,
|
|
.codec_id = AV_CODEC_ID_THEORA,
|
|
.parse_sdp_a_line = xiph_parse_sdp_line,
|
|
.alloc = xiph_new_context,
|
|
.free = xiph_free_context,
|
|
.parse_packet = xiph_handle_packet
|
|
};
|
|
|
|
RTPDynamicProtocolHandler ff_vorbis_dynamic_handler = {
|
|
.enc_name = "vorbis",
|
|
.codec_type = AVMEDIA_TYPE_AUDIO,
|
|
.codec_id = AV_CODEC_ID_VORBIS,
|
|
.init = xiph_vorbis_init,
|
|
.parse_sdp_a_line = xiph_parse_sdp_line,
|
|
.alloc = xiph_new_context,
|
|
.free = xiph_free_context,
|
|
.parse_packet = xiph_handle_packet
|
|
};
|