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Add support for H.261 RTP payload format (RFC 4587)

This commit is contained in:
ThomasVolkert 2014-08-23 21:25:39 +02:00 committed by Michael Niedermayer
parent ab1e431288
commit 50a4d5cfc6
9 changed files with 279 additions and 0 deletions
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1
MAINTAINERS
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@ -459,6 +459,7 @@ Muxers/Demuxers:
rmdec.c, rmenc.c Ronald S. Bultje, Kostya Shishkov
rtmp* Kostya Shishkov
rtp.c, rtpenc.c Martin Storsjo
rtpdec_h261.*, rtpenc_h261.* Thomas Volkert
rtpdec_asf.* Ronald S. Bultje
rtpenc_mpv.*, rtpenc_aac.* Martin Storsjo
rtsp.c Luca Barbato

3
libavcodec/mpegvideo_enc.c
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@ -2800,6 +2800,9 @@ static int encode_thread(AVCodecContext *c, void *arg){
if(s->start_mb_y == mb_y && mb_y > 0 && mb_x==0) is_gob_start=1;
switch(s->codec_id){
case AV_CODEC_ID_H261:
is_gob_start=0;//FIXME
break;
case AV_CODEC_ID_H263:
case AV_CODEC_ID_H263P:
if(!s->h263_slice_structured)

2
libavformat/Makefile
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@ -33,6 +33,7 @@ OBJS-$(CONFIG_RTPDEC) += rdt.o \
rtpdec_amr.o \
rtpdec_asf.o \
rtpdec_g726.o \
rtpdec_h261.o \
rtpdec_h263.o \
rtpdec_h263_rfc2190.o \
rtpdec_h264.o \
@ -362,6 +363,7 @@ OBJS-$(CONFIG_RTP_MUXER) += rtp.o \
rtpenc_aac.o \
rtpenc_latm.o \
rtpenc_amr.o \
rtpenc_h261.o \
rtpenc_h263.o \
rtpenc_h263_rfc2190.o \
rtpenc_jpeg.o \

1
libavformat/rtpdec.c
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@ -72,6 +72,7 @@ void ff_register_rtp_dynamic_payload_handlers(void)
ff_register_dynamic_payload_handler(&ff_g726_24_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_g726_32_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_g726_40_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_h261_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_h263_1998_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_h263_rfc2190_dynamic_handler);

5
libavformat/rtpdec_formats.h
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@ -31,6 +31,10 @@
*/
int ff_wms_parse_sdp_a_line(AVFormatContext *s, const char *p);
int ff_h261_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 ff_h263_handle_packet(AVFormatContext *ctx, PayloadContext *data,
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
const uint8_t *buf, int len, uint16_t seq, int flags);
@ -41,6 +45,7 @@ extern RTPDynamicProtocolHandler ff_g726_16_dynamic_handler;
extern RTPDynamicProtocolHandler ff_g726_24_dynamic_handler;
extern RTPDynamicProtocolHandler ff_g726_32_dynamic_handler;
extern RTPDynamicProtocolHandler ff_g726_40_dynamic_handler;
extern RTPDynamicProtocolHandler ff_h261_dynamic_handler;
extern RTPDynamicProtocolHandler ff_h263_1998_dynamic_handler;
extern RTPDynamicProtocolHandler ff_h263_2000_dynamic_handler;
extern RTPDynamicProtocolHandler ff_h263_rfc2190_dynamic_handler;

205
libavformat/rtpdec_h261.c Normal file
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@ -0,0 +1,205 @@
/*
* RTP parser for H.261 payload format (RFC 4587)
* Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com>
*
* 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
*/
#include "avformat.h"
#include "rtpdec_formats.h"
#include "libavcodec/get_bits.h"
#define RTP_H261_PAYLOAD_HEADER_SIZE 4
struct PayloadContext {
AVIOContext *buf;
uint8_t endbyte;
int endbyte_bits;
uint32_t timestamp;
};
static PayloadContext *h261_new_context(void)
{
return av_mallocz(sizeof(PayloadContext));
}
static void h261_free_dyn_buffer(AVIOContext **dyn_buf)
{
uint8_t *ptr_dyn_buffer;
avio_close_dyn_buf(*dyn_buf, &ptr_dyn_buffer);
av_free(ptr_dyn_buffer);
*dyn_buf = NULL;
}
static void h261_free_context(PayloadContext *pl_ctx)
{
/* return if context is invalid */
if (!pl_ctx)
return;
/* free buffer if it is valid */
if (pl_ctx->buf) {
h261_free_dyn_buffer(&pl_ctx->buf);
}
/* free context */
av_free(pl_ctx);
}
static av_cold int h261_init(AVFormatContext *ctx, int st_index,
PayloadContext *data)
{
//av_log(ctx, AV_LOG_DEBUG, "h261_init() for stream %d\n", st_index);
if (st_index < 0)
return 0;
ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
return 0;
}
int ff_h261_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 sbit, ebit, gobn, mbap, quant;
int res;
//av_log(ctx, AV_LOG_DEBUG, "got h261 RTP packet with time: %u\n", timestamp);
/* drop data of previous packets in case of non-continuous (loss) packet stream */
if (data->buf && data->timestamp != *timestamp) {
h261_free_dyn_buffer(&data->buf);
}
/* sanity check for size of input packet */
if (len < 5 /* 4 bytes header and 1 byte payload at least */) {
av_log(ctx, AV_LOG_ERROR, "Too short H.261 RTP packet\n");
return AVERROR_INVALIDDATA;
}
/*
decode the H.261 payload header according to section 4.1 of RFC 4587:
(uses 4 bytes between RTP header and H.261 stream per packet)
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|SBIT |EBIT |I|V| GOBN | MBAP | QUANT | HMVD | VMVD |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Start bit position (SBIT): 3 bits
End bit position (EBIT): 3 bits
INTRA-frame encoded data (I): 1 bit
Motion Vector flag (V): 1 bit
GOB number (GOBN): 4 bits
Macroblock address predictor (MBAP): 5 bits
Quantizer (QUANT): 5 bits
Horizontal motion vector data (HMVD): 5 bits
Vertical motion vector data (VMVD): 5 bits
*/
sbit = (buf[0] >> 5) & 0x07;
ebit = (buf[0] >> 2) & 0x07;
gobn = (buf[1] >> 4) & 0x0f;
mbap = ((buf[1] << 1) & 0x1e) | ((buf[1] >> 7) & 0x01);
quant = (buf[1] >> 4) & 0x0f;
/* pass the H.261 payload header and continue with the actual payload */
buf += RTP_H261_PAYLOAD_HEADER_SIZE;
len -= RTP_H261_PAYLOAD_HEADER_SIZE;
/* start frame buffering with new dynamic buffer */
if (!data->buf) {
/* sanity check: a new frame starts with gobn=0, sbit=0, mbap=0, uqnat=0 */
if (!gobn && !sbit && !mbap && !quant){
res = avio_open_dyn_buf(&data->buf);
if (res < 0)
return res;
/* update the timestamp in the frame packet with the one from the RTP packet */
data->timestamp = *timestamp;
} else {
/* frame not started yet, need more packets */
return AVERROR(EAGAIN);
}
}
/* do the "byte merging" at the boundaries of two consecutive frame fragments */
if (data->endbyte_bits || sbit) {
if (data->endbyte_bits == sbit) {
data->endbyte |= buf[0] & (0xff >> sbit);
data->endbyte_bits = 0;
buf++;
len--;
avio_w8(data->buf, data->endbyte);
} else {
/* ebit/sbit values inconsistent, assuming packet loss */
GetBitContext gb;
init_get_bits(&gb, buf, len*8 - ebit);
skip_bits(&gb, sbit);
if (data->endbyte_bits) {
data->endbyte |= get_bits(&gb, 8 - data->endbyte_bits);
avio_w8(data->buf, data->endbyte);
}
while (get_bits_left(&gb) >= 8)
avio_w8(data->buf, get_bits(&gb, 8));
data->endbyte_bits = get_bits_left(&gb);
if (data->endbyte_bits)
data->endbyte = get_bits(&gb, data->endbyte_bits) <<
(8 - data->endbyte_bits);
ebit = 0;
len = 0;
}
}
if (ebit) {
if (len > 0)
avio_write(data->buf, buf, len - 1);
data->endbyte_bits = 8 - ebit;
data->endbyte = buf[len - 1] & (0xff << ebit);
} else {
avio_write(data->buf, buf, len);
}
/* RTP marker bit means: last fragment of current frame was received;
otherwise, an additional fragment is needed for the current frame */
if (!(flags & RTP_FLAG_MARKER))
return AVERROR(EAGAIN);
/* write the completed last byte from the "byte merging" */
if (data->endbyte_bits)
avio_w8(data->buf, data->endbyte);
data->endbyte_bits = 0;
/* close frame buffering and create resulting A/V packet */
res = ff_rtp_finalize_packet(pkt, &data->buf, st->index);
if (res < 0)
return res;
return 0;
}
RTPDynamicProtocolHandler ff_h261_dynamic_handler = {
.enc_name = "H261",
.codec_type = AVMEDIA_TYPE_VIDEO,
.codec_id = AV_CODEC_ID_H261,
.init = h261_init,
.parse_packet = ff_h261_handle_packet,
.alloc = h261_new_context,
.free = h261_free_context,
.static_payload_id = 31,
};

4
libavformat/rtpenc.c
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@ -49,6 +49,7 @@ static const AVClass rtp_muxer_class = {
static int is_supported(enum AVCodecID id)
{
switch(id) {
case AV_CODEC_ID_H261:
case AV_CODEC_ID_H263:
case AV_CODEC_ID_H263P:
case AV_CODEC_ID_H264:
@ -556,6 +557,9 @@ static int rtp_write_packet(AVFormatContext *s1, AVPacket *pkt)
case AV_CODEC_ID_H264:
ff_rtp_send_h264(s1, pkt->data, size);
break;
case AV_CODEC_ID_H261:
ff_rtp_send_h261(s1, pkt->data, size);
break;
case AV_CODEC_ID_H263:
if (s->flags & FF_RTP_FLAG_RFC2190) {
int mb_info_size = 0;

1
libavformat/rtpenc.h
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@ -81,6 +81,7 @@ typedef struct RTPMuxContext RTPMuxContext;
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m);
void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size);
void ff_rtp_send_h261(AVFormatContext *s1, const uint8_t *buf1, int size);
void ff_rtp_send_h263(AVFormatContext *s1, const uint8_t *buf1, int size);
void ff_rtp_send_h263_rfc2190(AVFormatContext *s1, const uint8_t *buf1, int size,
const uint8_t *mb_info, int mb_info_size);

57
libavformat/rtpenc_h261.c Normal file
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@ -0,0 +1,57 @@
/*
* RTP packetization for H.261 video (RFC 4587)
* Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com>
*
* 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
*/
#include "avformat.h"
#include "rtpenc.h"
void ff_rtp_send_h261(AVFormatContext *s1, const uint8_t *frame_buf, int frame_size)
{
RTPMuxContext *rtp_ctx = s1->priv_data;
int processed_frame_size;
int last_packet_of_frame;
uint8_t *tmp_buf_ptr;
/* use the default 90 KHz time stamp */
rtp_ctx->timestamp = rtp_ctx->cur_timestamp;
/* continue as long as not all frame data is processed */
while (frame_size > 0) {
tmp_buf_ptr = rtp_ctx->buf;
*tmp_buf_ptr++ = 1; /* V=1 */
*tmp_buf_ptr++ = 0;
*tmp_buf_ptr++ = 0;
*tmp_buf_ptr++ = 0;
processed_frame_size = FFMIN(rtp_ctx->max_payload_size - 4, frame_size);
//XXX: parse the h.261 bitstream and improve frame splitting here
last_packet_of_frame = (processed_frame_size == frame_size);
memcpy(tmp_buf_ptr, frame_buf, processed_frame_size);
tmp_buf_ptr += processed_frame_size;
ff_rtp_send_data(s1, rtp_ctx->buf, tmp_buf_ptr - rtp_ctx->buf, last_packet_of_frame);
frame_buf += processed_frame_size;
frame_size -= processed_frame_size;
}
}