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h264_raw.m
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/*
* h264_raw.c
* Muxer
*
* Created by Ryan Walklin on 1/4/09.
* Copyright 2009 Ryan Walklin. All rights reserved.
*
*/
#include "h264_raw.h"
#include "config.h"
//#define DEBUG_H264
// From h264.cpp (MPEG4-IP project) with bug fixes from h264_parser
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2004. All Rights Reserved.
*
* Contributor(s):
* Bill May wmay@cisco.com
* Laurent Aimar (with much gratitude from the developers
* for his work on ctts creation)
*/
//#define DEBUG_H264 1
//#include <mp4creator.h>
//#include <mp4av_h264.h>
typedef struct nal_reader_t {
FILE *ifile;
uint8_t *buffer;
uint32_t buffer_on;
uint32_t buffer_size;
uint32_t buffer_size_max;
} nal_reader_t;
typedef struct
{
struct
{
int size_min;
int next;
int cnt;
int idx[17];
int poc[17];
} dpb;
int cnt;
int cnt_max;
int *frame;
} h264_dpb_t;
void DpbInit( h264_dpb_t *p )
{
p->dpb.cnt = 0;
p->dpb.next = 0;
p->dpb.size_min = 0;
p->cnt = 0;
p->cnt_max = 0;
p->frame = NULL;
}
void DpbClean( h264_dpb_t *p )
{
free( p->frame );
}
static void DpbUpdate( h264_dpb_t *p, int is_forced )
{
int i;
int pos;
if (!is_forced && p->dpb.cnt < 16)
return;
/* find the lowest poc */
pos = 0;
for (i = 1; i < p->dpb.cnt; i++)
{
if (p->dpb.poc[i] < p->dpb.poc[pos])
pos = i;
}
//fprintf( stderr, "lowest=%d\n", pos );
/* save the idx */
if (p->dpb.idx[pos] >= p->cnt_max)
{
int inc = 1000 + (p->dpb.idx[pos]-p->cnt_max);
p->cnt_max += inc;
p->frame = (int*)realloc( p->frame, sizeof(int)*p->cnt_max );
for (i=0;i<inc;i++)
p->frame[p->cnt_max-inc+i] = -1; /* To detect errors latter */
}
p->frame[p->dpb.idx[pos]] = p->cnt++;
/* Update the dpb minimal size */
if (pos > p->dpb.size_min)
p->dpb.size_min = pos;
/* update dpb */
for (i = pos; i < p->dpb.cnt-1; i++)
{
p->dpb.idx[i] = p->dpb.idx[i+1];
p->dpb.poc[i] = p->dpb.poc[i+1];
}
p->dpb.cnt--;
}
void DpbFlush( h264_dpb_t *p )
{
while (p->dpb.cnt > 0)
DpbUpdate( p, true );
}
void DpbAdd( h264_dpb_t *p, int poc, int is_idr )
{
if (is_idr)
DpbFlush( p );
p->dpb.idx[p->dpb.cnt] = p->dpb.next;
p->dpb.poc[p->dpb.cnt] = poc;
p->dpb.cnt++;
p->dpb.next++;
DpbUpdate( p, false );
}
int DpbFrameOffset( h264_dpb_t *p, int idx )
{
if (idx >= p->cnt)
return 0;
if (p->frame[idx] < 0)
return p->dpb.size_min; /* We have an error (probably broken/truncated bitstream) */
return p->dpb.size_min + p->frame[idx] - idx;
}
static bool remove_unused_sei_messages (nal_reader_t *nal,
uint64_t header_size)
{
uint32_t buffer_on = header_size;
buffer_on++; // increment past SEI message header
while (buffer_on < nal->buffer_on) {
uint32_t payload_type, payload_size, start, size;
if (nal->buffer[buffer_on] == 0x80) {
// rbsp_trailing_bits
return true;
}
if (nal->buffer_on - buffer_on <= 2) {
//fprintf(stderr, "extra bytes after SEI message\n");
#if 0
memset(nal->buffer + buffer_on, 0,
nal->buffer_on - buffer_on);
nal->buffer_on = buffer_on;
#endif
return true;
}
start = buffer_on;
payload_type = h264_read_sei_value(nal->buffer + buffer_on,
&size);
#ifdef DEBUG_H264
printf("sei type %d size %d on %d\n", payload_type,
size, buffer_on);
#endif
buffer_on += size;
payload_size = h264_read_sei_value(nal->buffer + buffer_on,
&size);
buffer_on += size + payload_size;
#ifdef DEBUG_H264
printf("sei size %d size %d on %d nal %d\n",
payload_size, size, buffer_on, nal->buffer_on);
#endif
if (buffer_on > nal->buffer_on) {
fprintf(stderr, "Error decoding sei message\n");
return false;
}
switch (payload_type) {
case 3:
case 10:
case 11:
case 12:
memmove(nal->buffer + start,
nal->buffer + buffer_on,
nal->buffer_size - buffer_on);
nal->buffer_size -= buffer_on - start;
nal->buffer_on -= buffer_on - start;
buffer_on = start;
break;
}
}
if (nal->buffer_on == header_size) return false;
return true;
}
static bool RefreshReader (nal_reader_t *nal,
uint32_t nal_start)
{
uint32_t bytes_left;
uint32_t bytes_read;
#ifdef DEBUG_H264_READER
printf("refresh - start %u buffer on %u size %u\n",
nal_start, nal->buffer_on, nal->buffer_size);
#endif
if (nal_start != 0) {
if (nal_start > nal->buffer_size) {
#ifdef DEBUG_H264
printf("nal start is greater than buffer size\n");
#endif
nal->buffer_on = 0;
} else {
bytes_left = nal->buffer_size - nal_start;
if (bytes_left > 0) {
memmove(nal->buffer,
nal->buffer + nal_start,
bytes_left);
nal->buffer_on -= nal_start;
#ifdef DEBUG_H264_READER
printf("move %u new on is %u\n", bytes_left, nal->buffer_on);
#endif
} else {
nal->buffer_on = 0;
}
nal->buffer_size = bytes_left;
}
} else {
if (feof(nal->ifile)) {
return false;
}
nal->buffer_size_max += 4096 * 4;
nal->buffer = (uint8_t *)realloc(nal->buffer, nal->buffer_size_max);
}
bytes_read = fread(nal->buffer + nal->buffer_size,
1,
nal->buffer_size_max - nal->buffer_size,
nal->ifile);
if (bytes_read == 0) return false;
#ifdef DEBUG_H264_READER
printf("read %u of %u\n", bytes_read,
nal->buffer_size_max - nal->buffer_size);
#endif
nal->buffer_size += bytes_read;
return true;
}
static bool LoadNal (nal_reader_t *nal)
{
if (nal->buffer_on != 0 || nal->buffer_size == 0) {
if (RefreshReader(nal, nal->buffer_on) == false) {
#ifdef DEBUG_H264
printf("refresh returned 0 - buffer on is %u, size %u\n",
nal->buffer_on, nal->buffer_size);
#endif
if (nal->buffer_on >= nal->buffer_size) return false;
// continue
}
}
// find start code
uint32_t start;
if (h264_is_start_code(nal->buffer) == false) {
start = h264_find_next_start_code(nal->buffer,
nal->buffer_size);
RefreshReader(nal, start);
}
while ((start = h264_find_next_start_code(nal->buffer + 4,
nal->buffer_size - 4)) == 0) {
if (RefreshReader(nal, 0) == false) {
// end of file - use the last NAL
nal->buffer_on = nal->buffer_size;
return true;
}
}
nal->buffer_on = start + 4;
return true;
}
MP4TrackId H264Creator (MP4FileHandle mp4File,
FILE* inFile, double VideoFrameRate, int Mp4TimeScale)
{
bool rc;
// the current syntactical object
// typically 1:1 with a sample
// but not always, i.e. non-VOP's
// the current sample
MP4SampleId sampleId = 1;
// track configuration info
uint8_t AVCProfileIndication = 0;
uint8_t profile_compat = 0;
uint8_t AVCLevelIndication = 0;
// first thing we need to do is read the headers
bool have_seq = false;
uint8_t nal_type;
nal_reader_t nal;
h264_decode_t h264_dec;
MP4Timestamp lastTime = 0, thisTime;
MP4SampleId samplesWritten = 0;
memset(&nal, 0, sizeof(nal));
nal.ifile = inFile;
if (VideoFrameRate == 0.0) {
// fprintf(stderr, "%s: Must specify frame rate when reading H.264 files",
// ProgName);
return MP4_INVALID_TRACK_ID;
}
while (have_seq == false) {
if (LoadNal(&nal) == false) {
fprintf(stderr, "Could not find sequence header\n");
return MP4_INVALID_TRACK_ID;
}
nal_type = h264_nal_unit_type(nal.buffer);
if (nal_type == H264_NAL_TYPE_SEQ_PARAM) {
have_seq = true;
uint64_t offset;
if (nal.buffer[2] == 1) offset = 3;
else offset = 4;
// skip the nal type byte
AVCProfileIndication = nal.buffer[offset + 1];
profile_compat = nal.buffer[offset + 2];
AVCLevelIndication = nal.buffer[offset + 3];
if (h264_read_seq_info(nal.buffer, nal.buffer_on, &h264_dec) == -1) {
fprintf(stderr, "Could not decode Sequence header\n");
return MP4_INVALID_TRACK_ID;
}
}
}
rewind(nal.ifile);
nal.buffer_size = 0;
nal.buffer_on = 0;
nal.buffer_size_max = 0;
free(nal.buffer);
nal.buffer = NULL;
u_int64_t mp4FrameDuration = 0;
mp4FrameDuration = (u_int64_t)(((double)Mp4TimeScale) / VideoFrameRate);
// create the new video track
MP4TrackId trackId;
trackId =
MP4AddH264VideoTrack(mp4File,
Mp4TimeScale,
mp4FrameDuration,
h264_dec.pic_width,
h264_dec.pic_height,
AVCProfileIndication,
profile_compat,
AVCLevelIndication,
3);
if (trackId == MP4_INVALID_TRACK_ID) {
fprintf(stderr,
"Can't create video track\n");
return MP4_INVALID_TRACK_ID;
}
if (MP4GetNumberOfTracks(mp4File, MP4_VIDEO_TRACK_TYPE, 0) == 1) {
uint32_t new_verb = MP4_VERBOSITY & ~(MP4_DETAILS_ERROR);
MP4SetVerbosity(mp4File, new_verb);
MP4SetVideoProfileLevel(mp4File, 0x7f);
MP4SetVerbosity(mp4File, MP4_VERBOSITY);
}
uint8_t *nal_buffer;
uint32_t nal_buffer_size, nal_buffer_size_max;
nal_buffer = NULL;
nal_buffer_size = 0;
nal_buffer_size_max = 0;
bool first = true;
bool nal_is_sync = false;
bool slice_is_idr = false;
int32_t poc = 0;
h264_dpb_t h264_dpb;
// now process the rest of the video stream
memset(&h264_dec, 0, sizeof(h264_dec));
DpbInit(&h264_dpb);
while ( LoadNal(&nal) != false ) {
uint32_t header_size;
header_size = nal.buffer[2] == 1 ? 3 : 4;
bool boundary = h264_detect_boundary(nal.buffer,
nal.buffer_on,
&h264_dec);
#ifdef DEBUG_H264
printf("Nal size %u boundary %u\n", nal.buffer_on, boundary);
#endif
if (boundary && first == false) {
// write the previous sample
if (nal_buffer_size != 0) {
#ifdef DEBUG_H264
printf("sid %d writing %u\n", samplesWritten,
nal_buffer_size);
#endif
samplesWritten++;
double thiscalc;
thiscalc = samplesWritten;
thiscalc *= Mp4TimeScale;
thiscalc /= VideoFrameRate;
thisTime = (MP4Duration)thiscalc;
MP4Duration dur;
dur = thisTime - lastTime;
rc = MP4WriteSample(mp4File,
trackId,
nal_buffer,
nal_buffer_size,
dur,
0,
nal_is_sync);
lastTime = thisTime;
if ( !rc ) {
fprintf(stderr, "Can't write video frame %u\n", sampleId);
MP4DeleteTrack(mp4File, trackId);
return MP4_INVALID_TRACK_ID;
}
sampleId++;
DpbAdd( &h264_dpb, poc, slice_is_idr );
nal_is_sync = false;
#ifdef DEBUG_H264
printf("wrote frame %d %U64F\n", nal_buffer_size, thisTime);
#endif
nal_buffer_size = 0;
}
}
bool copy_nal_to_buffer = false;
if (MP4_VERBOSITY & MP4_DETAILS_SAMPLE) {
printf("H264 type %x size %u\n",
h264_dec.nal_unit_type, nal.buffer_on);
}
if (h264_nal_unit_type_is_slice(h264_dec.nal_unit_type)) {
// copy all seis, etc before indicating first
first = false;
copy_nal_to_buffer = true;
slice_is_idr = h264_dec.nal_unit_type == H264_NAL_TYPE_IDR_SLICE;
poc = h264_dec.pic_order_cnt;
nal_is_sync = h264_slice_is_idr(&h264_dec);
} else {
switch (h264_dec.nal_unit_type) {
case H264_NAL_TYPE_SEQ_PARAM:
// doesn't get added to sample buffer
// remove header
MP4AddH264SequenceParameterSet(mp4File, trackId,
nal.buffer + header_size,
nal.buffer_on - header_size);
break;
case H264_NAL_TYPE_PIC_PARAM:
// doesn't get added to sample buffer
MP4AddH264PictureParameterSet(mp4File, trackId,
nal.buffer + header_size,
nal.buffer_on - header_size);
break;
case H264_NAL_TYPE_FILLER_DATA:
// doesn't get copied
break;
case H264_NAL_TYPE_SEI:
copy_nal_to_buffer = remove_unused_sei_messages(&nal, header_size);
break;
case H264_NAL_TYPE_ACCESS_UNIT:
// note - may not want to copy this - not needed
default:
copy_nal_to_buffer = true;
break;
}
}
if (copy_nal_to_buffer) {
uint32_t to_write;
to_write = nal.buffer_on - header_size;
if (to_write + 4 + nal_buffer_size > nal_buffer_size_max) {
nal_buffer_size_max += nal.buffer_on + 4;
nal_buffer = (uint8_t *)realloc(nal_buffer, nal_buffer_size_max);
}
nal_buffer[nal_buffer_size] = (to_write >> 24) & 0xff;
nal_buffer[nal_buffer_size + 1] = (to_write >> 16) & 0xff;
nal_buffer[nal_buffer_size + 2] = (to_write >> 8)& 0xff;
nal_buffer[nal_buffer_size + 3] = to_write & 0xff;
memcpy(nal_buffer + nal_buffer_size + 4,
nal.buffer + header_size,
to_write);
#ifdef DEBUG_H264
printf("copy nal - to_write %u offset %u total %u\n",
to_write, nal_buffer_size, nal_buffer_size + 4 + to_write);
printf("header size %d bytes after %02x %02x\n",
header_size, nal.buffer[header_size],
nal.buffer[header_size + 1]);
#endif
nal_buffer_size += to_write + 4;
}
}
if (nal_buffer_size != 0) {
samplesWritten++;
double thiscalc;
thiscalc = samplesWritten;
thiscalc *= Mp4TimeScale;
thiscalc /= VideoFrameRate;
thisTime = (MP4Duration)thiscalc;
MP4Duration dur;
dur = thisTime - lastTime;
rc = MP4WriteSample(mp4File,
trackId,
nal_buffer,
nal_buffer_size,
dur,
0,
nal_is_sync);
if ( !rc ) {
fprintf(stderr, "Can't write video frame %u\n", sampleId);
MP4DeleteTrack(mp4File, trackId);
return MP4_INVALID_TRACK_ID;
}
DpbAdd(&h264_dpb, h264_dec.pic_order_cnt, slice_is_idr);
}
DpbFlush(&h264_dpb);
if (h264_dpb.dpb.size_min > 0) {
unsigned int ix;
for (ix = 0; ix < samplesWritten; ix++) {;
const int offset = DpbFrameOffset(&h264_dpb, ix);
//fprintf( stderr, "dts=%d pts=%d offset=%d\n", ix, ix+offset, offset );
MP4SetSampleRenderingOffset(mp4File, trackId, 1 + ix,
offset * mp4FrameDuration);
}
}
DpbClean(&h264_dpb);
return trackId;
}