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Merge commit 'a505c0d7373336a4cc5aa2022111c46bdd388b1f'

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* commit 'a505c0d7373336a4cc5aa2022111c46bdd388b1f':
  rtp: Initial H.261 support

Conflicts:
	Changelog
	libavformat/rtpdec_h261.c
	libavformat/rtpenc_h261.c
	libavformat/sdp.c
	libavformat/version.h

See: 50a4d5cfc6
Merged-by: Michael Niedermayer <michaelni@gmx.at>
pull/101/head
Michael Niedermayer 10 years ago
parent 3f5d1c8130 a505c0d737
commit 5162af67f4
7 changed files with 138 additions and 86 deletions
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  1. 2
      Changelog
  2. 4
      libavformat/rtpdec_formats.h
  3. 115
      libavformat/rtpdec_h261.c
  4. 15
      libavformat/rtpenc.c
  5. 81
      libavformat/rtpenc_h261.c
  6. 5
      libavformat/sdp.c
  7. 2
      libavformat/version.h

2
Changelog
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@ -34,7 +34,7 @@ version 2.4:
- ICY metadata are now requested by default with the HTTP protocol
- support for using metadata in stream specifiers in fftools
- LZMA compression support in TIFF decoder
- support for H.261 RTP payload format (RFC 4587)
- H.261 RTP payload format (RFC 4587) depacketizer and experimental packetizer
- HEVC/H.265 RTP payload format (draft v6) depacketizer
- added codecview filter to visualize information exported by some codecs
- Matroska 3D support thorugh side data

4
libavformat/rtpdec_formats.h
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@ -31,10 +31,6 @@
*/
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);

115
libavformat/rtpdec_h261.c
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@ -19,11 +19,11 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/get_bits.h"
#include "avformat.h"
#include "rtpdec_formats.h"
#include "libavcodec/get_bits.h"
#define RTP_H261_PAYLOAD_HEADER_SIZE 4
#define RTP_H261_PAYLOAD_HEADER_SIZE 4
struct PayloadContext {
AVIOContext *buf;
@ -63,8 +63,6 @@ static av_cold void h261_free_context(PayloadContext *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;
@ -73,16 +71,18 @@ static av_cold int h261_init(AVFormatContext *ctx, int st_index,
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)
static int h261_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_h261_ctx,
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;
/* 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);
/* drop data of previous packets in case of non-continuous (lossy) packet stream */
if (rtp_h261_ctx->buf && rtp_h261_ctx->timestamp != *timestamp) {
h261_free_dyn_buffer(&rtp_h261_ctx->buf);
rtp_h261_ctx->endbyte_bits = 0;
}
/* sanity check for size of input packet: 1 byte payload at least */
@ -92,26 +92,25 @@ int ff_h261_handle_packet(AVFormatContext *ctx, PayloadContext *data,
}
/*
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
*/
* 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;
@ -123,14 +122,14 @@ int ff_h261_handle_packet(AVFormatContext *ctx, PayloadContext *data,
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 (!rtp_h261_ctx->buf) {
/* sanity check: a new frame starts with gobn=0, sbit=0, mbap=0, quant=0 */
if (!gobn && !sbit && !mbap && !quant) {
res = avio_open_dyn_buf(&rtp_h261_ctx->buf);
if (res < 0)
return res;
/* update the timestamp in the frame packet with the one from the RTP packet */
data->timestamp = *timestamp;
rtp_h261_ctx->timestamp = *timestamp;
} else {
/* frame not started yet, need more packets */
return AVERROR(EAGAIN);
@ -138,39 +137,39 @@ int ff_h261_handle_packet(AVFormatContext *ctx, PayloadContext *data,
}
/* 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;
if (rtp_h261_ctx->endbyte_bits || sbit) {
if (rtp_h261_ctx->endbyte_bits == sbit) {
rtp_h261_ctx->endbyte |= buf[0] & (0xff >> sbit);
rtp_h261_ctx->endbyte_bits = 0;
buf++;
len--;
avio_w8(data->buf, data->endbyte);
avio_w8(rtp_h261_ctx->buf, rtp_h261_ctx->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);
if (rtp_h261_ctx->endbyte_bits) {
rtp_h261_ctx->endbyte |= get_bits(&gb, 8 - rtp_h261_ctx->endbyte_bits);
avio_w8(rtp_h261_ctx->buf, rtp_h261_ctx->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);
avio_w8(rtp_h261_ctx->buf, get_bits(&gb, 8));
rtp_h261_ctx->endbyte_bits = get_bits_left(&gb);
if (rtp_h261_ctx->endbyte_bits)
rtp_h261_ctx->endbyte = get_bits(&gb, rtp_h261_ctx->endbyte_bits) <<
(8 - rtp_h261_ctx->endbyte_bits);
ebit = 0;
len = 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);
avio_write(rtp_h261_ctx->buf, buf, len - 1);
rtp_h261_ctx->endbyte_bits = 8 - ebit;
rtp_h261_ctx->endbyte = buf[len - 1] & (0xff << ebit);
} else {
avio_write(data->buf, buf, len);
avio_write(rtp_h261_ctx->buf, buf, len);
}
/* RTP marker bit means: last fragment of current frame was received;
@ -179,12 +178,12 @@ int ff_h261_handle_packet(AVFormatContext *ctx, PayloadContext *data,
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;
if (rtp_h261_ctx->endbyte_bits)
avio_w8(rtp_h261_ctx->buf, rtp_h261_ctx->endbyte);
rtp_h261_ctx->endbyte_bits = 0;
/* close frame buffering and create resulting A/V packet */
res = ff_rtp_finalize_packet(pkt, &data->buf, st->index);
res = ff_rtp_finalize_packet(pkt, &rtp_h261_ctx->buf, st->index);
if (res < 0)
return res;
@ -196,8 +195,8 @@ RTPDynamicProtocolHandler ff_h261_dynamic_handler = {
.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,
.parse_packet = h261_handle_packet,
.static_payload_id = 31,
};

15
libavformat/rtpenc.c
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@ -89,7 +89,7 @@ static int is_supported(enum AVCodecID id)
static int rtp_write_header(AVFormatContext *s1)
{
RTPMuxContext *s = s1->priv_data;
int n;
int n, ret = AVERROR(EINVAL);
AVStream *st;
if (s1->nb_streams != 1) {
@ -195,6 +195,17 @@ static int rtp_write_header(AVFormatContext *s1)
s->max_payload_size = n * TS_PACKET_SIZE;
s->buf_ptr = s->buf;
break;
case AV_CODEC_ID_H261:
if (s1->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
av_log(s, AV_LOG_ERROR,
"Packetizing H261 is experimental and produces incorrect "
"packetization for cases where GOBs don't fit into packets "
"(even though most receivers may handle it just fine). "
"Please set -f_strict experimental in order to enable it.\n");
ret = AVERROR_EXPERIMENTAL;
goto fail;
}
break;
case AV_CODEC_ID_H264:
/* check for H.264 MP4 syntax */
if (st->codec->extradata_size > 4 && st->codec->extradata[0] == 1) {
@ -277,7 +288,7 @@ defaultcase:
fail:
av_freep(&s->buf);
return AVERROR(EINVAL);
return ret;
}
/* send an rtcp sender report packet */

81
libavformat/rtpenc_h261.c
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@ -22,36 +22,81 @@
#include "avformat.h"
#include "rtpenc.h"
void ff_rtp_send_h261(AVFormatContext *s1, const uint8_t *frame_buf, int frame_size)
#define RTP_H261_HEADER_SIZE 4
static const uint8_t *find_resync_marker_reverse(const uint8_t *restrict start,
const uint8_t *restrict end)
{
const uint8_t *p = end - 1;
start += 1; /* Make sure we never return the original start. */
for (; p > start; p--) {
if (p[0] == 0 && p[1] == 1)
return p;
}
return end;
}
void ff_rtp_send_h261(AVFormatContext *ctx, const uint8_t *frame_buf, int frame_size)
{
RTPMuxContext *rtp_ctx = s1->priv_data;
int processed_frame_size;
int cur_frame_size;
int last_packet_of_frame;
uint8_t *tmp_buf_ptr;
RTPMuxContext *rtp_ctx = ctx->priv_data;
/* 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);
/*
* encode 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
*/
rtp_ctx->buf[0] = 1; /* sbit=0, ebit=0, i=0, v=1 */
rtp_ctx->buf[1] = 0; /* gobn=0, mbap=0 */
rtp_ctx->buf[2] = 0; /* quant=0, hmvd=5 */
rtp_ctx->buf[3] = 0; /* vmvd=0 */
if (frame_size < 2 || frame_buf[0] != 0 || frame_buf[1] != 1) {
/* A full, correct fix for this would be to make the H261 encoder
* support inserting extra GOB headers (triggered by setting e.g.
* "-ps 1"), and including information about macroblock boundaries
* (such as for h263_rfc2190). */
av_log(ctx, AV_LOG_WARNING,
"RTP/H261 packet not cut at a GOB boundary, not signaled correctly\n");
}
//XXX: parse the h.261 bitstream and improve frame splitting here
cur_frame_size = FFMIN(rtp_ctx->max_payload_size - RTP_H261_HEADER_SIZE, frame_size);
last_packet_of_frame = (processed_frame_size == frame_size);
/* look for a better place to split the frame into packets */
if (cur_frame_size < frame_size) {
const uint8_t *packet_end = find_resync_marker_reverse(frame_buf,
frame_buf + cur_frame_size);
cur_frame_size = packet_end - frame_buf;
}
memcpy(tmp_buf_ptr, frame_buf, processed_frame_size);
tmp_buf_ptr += processed_frame_size;
/* calculate the "marker" bit for the RTP header */
last_packet_of_frame = cur_frame_size == frame_size;
ff_rtp_send_data(s1, rtp_ctx->buf, tmp_buf_ptr - rtp_ctx->buf, last_packet_of_frame);
/* complete and send RTP packet */
memcpy(&rtp_ctx->buf[RTP_H261_HEADER_SIZE], frame_buf, cur_frame_size);
ff_rtp_send_data(ctx, rtp_ctx->buf, RTP_H261_HEADER_SIZE + cur_frame_size, last_packet_of_frame);
frame_buf += processed_frame_size;
frame_size -= processed_frame_size;
frame_buf += cur_frame_size;
frame_size -= cur_frame_size;
}
}

5
libavformat/sdp.c
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@ -504,9 +504,10 @@ static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c,
/* only QCIF and CIF are specified as supported in RFC 4587 */
if (c->width == 176 && c->height == 144)
pic_fmt = "QCIF=1";
if (c->width == 352 && c->height == 288)
else if (c->width == 352 && c->height == 288)
pic_fmt = "CIF=1";
av_strlcatf(buff, size, "a=rtpmap:%d H261/90000\r\n", payload_type);
if (payload_type >= RTP_PT_PRIVATE)
av_strlcatf(buff, size, "a=rtpmap:%d H261/90000\r\n", payload_type);
if (pic_fmt)
av_strlcatf(buff, size, "a=fmtp:%d %s\r\n", payload_type, pic_fmt);
break;

2
libavformat/version.h
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@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 56
#define LIBAVFORMAT_VERSION_MINOR 15
#define LIBAVFORMAT_VERSION_MICRO 106
#define LIBAVFORMAT_VERSION_MICRO 107
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \

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