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976a8b2179
ffmpeg/libavformat/ffmdec.c
Michael Niedermayer 976a8b2179 Merge remote-tracking branch 'qatar/master' 
* qatar/master: (40 commits)
  H.264: template left MB handling
  H.264: faster fill_decode_caches
  H.264: faster write_back_*
  H.264: faster fill_filter_caches
  H.264: make filter_mb_fast support the case of unavailable top mb
  Do not include log.h in avutil.h
  Do not include pixfmt.h in avutil.h
  Do not include rational.h in avutil.h
  Do not include mathematics.h in avutil.h
  Do not include intfloat_readwrite.h in avutil.h
  Remove return statements following infinite loops without break
  RTSP: Doxygen comment cleanup
  doxygen: Escape '\' in Doxygen documentation.
  md5: cosmetics
  md5: use AV_WL32 to write result
  md5: add fate test
  md5: include correct headers
  md5: fix test program
  doxygen: Drop array size declarations from Doxygen parameter names.
  doxygen: Fix parameter names to match the function prototypes.
  ...

Conflicts:
	libavcodec/x86/dsputil_mmx.c
	libavformat/flvenc.c
	libavformat/oggenc.c
	libavformat/wtv.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-07-04 00:45:21 +02:00

521 lines
16 KiB
C
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/*
* FFM (ffserver live feed) demuxer
* Copyright (c) 2001 Fabrice Bellard
*
* 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 "libavutil/intreadwrite.h"
#include "libavutil/intfloat_readwrite.h"
#include "avformat.h"
#include "ffm.h"
#if CONFIG_FFSERVER
#include <unistd.h>
int64_t ffm_read_write_index(int fd)
{
uint8_t buf[8];
lseek(fd, 8, SEEK_SET);
if (read(fd, buf, 8) != 8)
return AVERROR(EIO);
return AV_RB64(buf);
}
int ffm_write_write_index(int fd, int64_t pos)
{
uint8_t buf[8];
int i;
for(i=0;i<8;i++)
buf[i] = (pos >> (56 - i * 8)) & 0xff;
lseek(fd, 8, SEEK_SET);
if (write(fd, buf, 8) != 8)
return AVERROR(EIO);
return 8;
}
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size)
{
FFMContext *ffm = s->priv_data;
ffm->write_index = pos;
ffm->file_size = file_size;
}
#endif // CONFIG_FFSERVER
static int ffm_is_avail_data(AVFormatContext *s, int size)
{
FFMContext *ffm = s->priv_data;
int64_t pos, avail_size;
int len;
len = ffm->packet_end - ffm->packet_ptr;
if (size <= len)
return 1;
pos = avio_tell(s->pb);
if (!ffm->write_index) {
if (pos == ffm->file_size)
return AVERROR_EOF;
avail_size = ffm->file_size - pos;
} else {
if (pos == ffm->write_index) {
/* exactly at the end of stream */
return AVERROR(EAGAIN);
} else if (pos < ffm->write_index) {
avail_size = ffm->write_index - pos;
} else {
avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
}
}
avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
if (size <= avail_size)
return 1;
else
return AVERROR(EAGAIN);
}
static int ffm_resync(AVFormatContext *s, int state)
{
av_log(s, AV_LOG_ERROR, "resyncing\n");
while (state != PACKET_ID) {
if (url_feof(s->pb)) {
av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n");
return -1;
}
state = (state << 8) | avio_r8(s->pb);
}
return 0;
}
/* first is true if we read the frame header */
static int ffm_read_data(AVFormatContext *s,
uint8_t *buf, int size, int header)
{
FFMContext *ffm = s->priv_data;
AVIOContext *pb = s->pb;
int len, fill_size, size1, frame_offset, id;
size1 = size;
while (size > 0) {
redo:
len = ffm->packet_end - ffm->packet_ptr;
if (len < 0)
return -1;
if (len > size)
len = size;
if (len == 0) {
if (avio_tell(pb) == ffm->file_size)
avio_seek(pb, ffm->packet_size, SEEK_SET);
retry_read:
id = avio_rb16(pb); /* PACKET_ID */
if (id != PACKET_ID)
if (ffm_resync(s, id) < 0)
return -1;
fill_size = avio_rb16(pb);
ffm->dts = avio_rb64(pb);
frame_offset = avio_rb16(pb);
avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
if (ffm->packet_end < ffm->packet || frame_offset < 0)
return -1;
/* if first packet or resynchronization packet, we must
handle it specifically */
if (ffm->first_packet || (frame_offset & 0x8000)) {
if (!frame_offset) {
/* This packet has no frame headers in it */
if (avio_tell(pb) >= ffm->packet_size * 3) {
avio_seek(pb, -ffm->packet_size * 2, SEEK_CUR);
goto retry_read;
}
/* This is bad, we cannot find a valid frame header */
return 0;
}
ffm->first_packet = 0;
if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE)
return -1;
ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
if (!header)
break;
} else {
ffm->packet_ptr = ffm->packet;
}
goto redo;
}
memcpy(buf, ffm->packet_ptr, len);
buf += len;
ffm->packet_ptr += len;
size -= len;
header = 0;
}
return size1 - size;
}
/* ensure that acutal seeking happens between FFM_PACKET_SIZE
and file_size - FFM_PACKET_SIZE */
static void ffm_seek1(AVFormatContext *s, int64_t pos1)
{
FFMContext *ffm = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE);
pos = FFMAX(pos, FFM_PACKET_SIZE);
av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
avio_seek(pb, pos, SEEK_SET);
}
static int64_t get_dts(AVFormatContext *s, int64_t pos)
{
AVIOContext *pb = s->pb;
int64_t dts;
ffm_seek1(s, pos);
avio_skip(pb, 4);
dts = avio_rb64(pb);
av_dlog(s, "dts=%0.6f\n", dts / 1000000.0);
return dts;
}
static void adjust_write_index(AVFormatContext *s)
{
FFMContext *ffm = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pts;
//int64_t orig_write_index = ffm->write_index;
int64_t pos_min, pos_max;
int64_t pts_start;
int64_t ptr = avio_tell(pb);
pos_min = 0;
pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
pts_start = get_dts(s, pos_min);
pts = get_dts(s, pos_max);
if (pts - 100000 > pts_start)
goto end;
ffm->write_index = FFM_PACKET_SIZE;
pts_start = get_dts(s, pos_min);
pts = get_dts(s, pos_max);
if (pts - 100000 <= pts_start) {
while (1) {
int64_t newpos;
int64_t newpts;
newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
if (newpos == pos_min)
break;
newpts = get_dts(s, newpos);
if (newpts - 100000 <= pts) {
pos_max = newpos;
pts = newpts;
} else {
pos_min = newpos;
}
}
ffm->write_index += pos_max;
}
//printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
//printf("pts range %0.6f - %0.6f\n", get_dts(s, 0) / 1000000. , get_dts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
end:
avio_seek(pb, ptr, SEEK_SET);
}
static int ffm_close(AVFormatContext *s)
{
int i;
for (i = 0; i < s->nb_streams; i++)
av_freep(&s->streams[i]->codec->rc_eq);
return 0;
}
static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
FFMContext *ffm = s->priv_data;
AVStream *st;
AVIOContext *pb = s->pb;
AVCodecContext *codec;
int i, nb_streams;
uint32_t tag;
/* header */
tag = avio_rl32(pb);
if (tag != MKTAG('F', 'F', 'M', '1'))
goto fail;
ffm->packet_size = avio_rb32(pb);
if (ffm->packet_size != FFM_PACKET_SIZE)
goto fail;
ffm->write_index = avio_rb64(pb);
/* get also filesize */
if (pb->seekable) {
ffm->file_size = avio_size(pb);
if (ffm->write_index)
adjust_write_index(s);
} else {
ffm->file_size = (UINT64_C(1) << 63) - 1;
}
nb_streams = avio_rb32(pb);
avio_rb32(pb); /* total bitrate */
/* read each stream */
for(i=0;i<nb_streams;i++) {
char rc_eq_buf[128];
st = av_new_stream(s, 0);
if (!st)
goto fail;
av_set_pts_info(st, 64, 1, 1000000);
codec = st->codec;
/* generic info */
codec->codec_id = avio_rb32(pb);
codec->codec_type = avio_r8(pb); /* codec_type */
codec->bit_rate = avio_rb32(pb);
st->quality = avio_rb32(pb);
codec->flags = avio_rb32(pb);
codec->flags2 = avio_rb32(pb);
codec->debug = avio_rb32(pb);
/* specific info */
switch(codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
codec->time_base.num = avio_rb32(pb);
codec->time_base.den = avio_rb32(pb);
codec->width = avio_rb16(pb);
codec->height = avio_rb16(pb);
codec->gop_size = avio_rb16(pb);
codec->pix_fmt = avio_rb32(pb);
codec->qmin = avio_r8(pb);
codec->qmax = avio_r8(pb);
codec->max_qdiff = avio_r8(pb);
codec->qcompress = avio_rb16(pb) / 10000.0;
codec->qblur = avio_rb16(pb) / 10000.0;
codec->bit_rate_tolerance = avio_rb32(pb);
codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
codec->rc_max_rate = avio_rb32(pb);
codec->rc_min_rate = avio_rb32(pb);
codec->rc_buffer_size = avio_rb32(pb);
codec->i_quant_factor = av_int2dbl(avio_rb64(pb));
codec->b_quant_factor = av_int2dbl(avio_rb64(pb));
codec->i_quant_offset = av_int2dbl(avio_rb64(pb));
codec->b_quant_offset = av_int2dbl(avio_rb64(pb));
codec->dct_algo = avio_rb32(pb);
codec->strict_std_compliance = avio_rb32(pb);
codec->max_b_frames = avio_rb32(pb);
codec->luma_elim_threshold = avio_rb32(pb);
codec->chroma_elim_threshold = avio_rb32(pb);
codec->mpeg_quant = avio_rb32(pb);
codec->intra_dc_precision = avio_rb32(pb);
codec->me_method = avio_rb32(pb);
codec->mb_decision = avio_rb32(pb);
codec->nsse_weight = avio_rb32(pb);
codec->frame_skip_cmp = avio_rb32(pb);
codec->rc_buffer_aggressivity = av_int2dbl(avio_rb64(pb));
codec->codec_tag = avio_rb32(pb);
codec->thread_count = avio_r8(pb);
codec->coder_type = avio_rb32(pb);
codec->me_cmp = avio_rb32(pb);
codec->partitions = avio_rb32(pb);
codec->me_subpel_quality = avio_rb32(pb);
codec->me_range = avio_rb32(pb);
codec->keyint_min = avio_rb32(pb);
codec->scenechange_threshold = avio_rb32(pb);
codec->b_frame_strategy = avio_rb32(pb);
codec->qcompress = av_int2dbl(avio_rb64(pb));
codec->qblur = av_int2dbl(avio_rb64(pb));
codec->max_qdiff = avio_rb32(pb);
codec->refs = avio_rb32(pb);
codec->directpred = avio_rb32(pb);
break;
case AVMEDIA_TYPE_AUDIO:
codec->sample_rate = avio_rb32(pb);
codec->channels = avio_rl16(pb);
codec->frame_size = avio_rl16(pb);
codec->sample_fmt = (int16_t) avio_rl16(pb);
break;
default:
goto fail;
}
if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
codec->extradata_size = avio_rb32(pb);
codec->extradata = av_malloc(codec->extradata_size);
if (!codec->extradata)
return AVERROR(ENOMEM);
avio_read(pb, codec->extradata, codec->extradata_size);
}
}
/* get until end of block reached */
while ((avio_tell(pb) % ffm->packet_size) != 0)
avio_r8(pb);
/* init packet demux */
ffm->packet_ptr = ffm->packet;
ffm->packet_end = ffm->packet;
ffm->frame_offset = 0;
ffm->dts = 0;
ffm->read_state = READ_HEADER;
ffm->first_packet = 1;
return 0;
fail:
ffm_close(s);
return -1;
}
/* return < 0 if eof */
static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int size;
FFMContext *ffm = s->priv_data;
int duration, ret;
switch(ffm->read_state) {
case READ_HEADER:
if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0)
return ret;
av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
FRAME_HEADER_SIZE)
return -1;
if (ffm->header[1] & FLAG_DTS)
if (ffm_read_data(s, ffm->header+16, 4, 1) != 4)
return -1;
ffm->read_state = READ_DATA;
/* fall thru */
case READ_DATA:
size = AV_RB24(ffm->header + 2);
if ((ret = ffm_is_avail_data(s, size)) < 0)
return ret;
duration = AV_RB24(ffm->header + 5);
av_new_packet(pkt, size);
pkt->stream_index = ffm->header[0];
if ((unsigned)pkt->stream_index >= s->nb_streams) {
av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
av_free_packet(pkt);
ffm->read_state = READ_HEADER;
return -1;
}
pkt->pos = avio_tell(s->pb);
if (ffm->header[1] & FLAG_KEY_FRAME)
pkt->flags |= AV_PKT_FLAG_KEY;
ffm->read_state = READ_HEADER;
if (ffm_read_data(s, pkt->data, size, 0) != size) {
/* bad case: desynchronized packet. we cancel all the packet loading */
av_free_packet(pkt);
return -1;
}
pkt->pts = AV_RB64(ffm->header+8);
if (ffm->header[1] & FLAG_DTS)
pkt->dts = pkt->pts - AV_RB32(ffm->header+16);
else
pkt->dts = pkt->pts;
pkt->duration = duration;
break;
}
return 0;
}
/* seek to a given time in the file. The file read pointer is
positioned at or before pts. XXX: the following code is quite
approximative */
static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
{
FFMContext *ffm = s->priv_data;
int64_t pos_min, pos_max, pos;
int64_t pts_min, pts_max, pts;
double pos1;
av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
/* find the position using linear interpolation (better than
dichotomy in typical cases) */
pos_min = FFM_PACKET_SIZE;
pos_max = ffm->file_size - FFM_PACKET_SIZE;
while (pos_min <= pos_max) {
pts_min = get_dts(s, pos_min);
pts_max = get_dts(s, pos_max);
/* linear interpolation */
pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
(double)(pts_max - pts_min);
pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
if (pos <= pos_min)
pos = pos_min;
else if (pos >= pos_max)
pos = pos_max;
pts = get_dts(s, pos);
/* check if we are lucky */
if (pts == wanted_pts) {
goto found;
} else if (pts > wanted_pts) {
pos_max = pos - FFM_PACKET_SIZE;
} else {
pos_min = pos + FFM_PACKET_SIZE;
}
}
pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
found:
ffm_seek1(s, pos);
/* reset read state */
ffm->read_state = READ_HEADER;
ffm->packet_ptr = ffm->packet;
ffm->packet_end = ffm->packet;
ffm->first_packet = 1;
return 0;
}
static int ffm_probe(AVProbeData *p)
{
if (
p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
p->buf[3] == '1')
return AVPROBE_SCORE_MAX + 1;
return 0;
}
AVInputFormat ff_ffm_demuxer = {
"ffm",
NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
sizeof(FFMContext),
ffm_probe,
ffm_read_header,
ffm_read_packet,
ffm_close,
ffm_seek,
};
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