forked from ezgranny420/HandBrake
/
decavcodec.c
1592 lines (1440 loc) · 52.9 KB
/
decavcodec.c
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/* decavcodec.c
Copyright (c) 2003-2012 HandBrake Team
This file is part of the HandBrake source code
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License v2.
For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
/* This module is Handbrake's interface to the ffmpeg decoder library
(libavcodec & small parts of libavformat). It contains four Handbrake
"work objects":
decavcodeca connects HB to an ffmpeg audio decoder
decavcodecv connects HB to an ffmpeg video decoder
(Two different routines are needed because the ffmpeg library
has different decoder calling conventions for audio & video.
These work objects are self-contained & follow all
of HB's conventions for a decoder module. They can be used like
any other HB decoder (deca52, decmpeg2, etc.).
These decoders handle 2 kinds of input. Streams that are demuxed
by HandBrake and streams that are demuxed by libavformat. In the
case of streams that are demuxed by HandBrake, there is an extra
parse step required that happens in decodeVideo and decavcodecaWork.
In the case of streams that are demuxed by libavformat, there is context
information that we need from the libavformat. This information is
propagated from hb_stream_open to these decoders through title->opaque_priv.
A consequence of the above is that the streams that are demuxed by HandBrake
*can't* use information from the AVStream because there isn't one - they
get their data from either the dvd reader or the mpeg reader, not the ffmpeg
stream reader. That means that they have to make up for deficiencies in the
AVCodecContext info by using stuff kept in the HB "title" struct. It
also means that ffmpeg codecs that randomly scatter state needed by
the decoder across both the AVCodecContext & the AVStream (e.g., the
VC1 decoder) can't easily be used by the HB mpeg stream reader.
*/
#include "hb.h"
#include "hbffmpeg.h"
#include "downmix.h"
#include "libavcodec/audioconvert.h"
static void compute_frame_duration( hb_work_private_t *pv );
static void flushDelayQueue( hb_work_private_t *pv );
static int decavcodecaInit( hb_work_object_t *, hb_job_t * );
static int decavcodecaWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
static void decavcodecClose( hb_work_object_t * );
static int decavcodecaInfo( hb_work_object_t *, hb_work_info_t * );
static int decavcodecaBSInfo( hb_work_object_t *, const hb_buffer_t *, hb_work_info_t * );
hb_work_object_t hb_decavcodeca =
{
.id = WORK_DECAVCODEC,
.name = "Audio decoder (libavcodec)",
.init = decavcodecaInit,
.work = decavcodecaWork,
.close = decavcodecClose,
.info = decavcodecaInfo,
.bsinfo = decavcodecaBSInfo
};
#define HEAP_SIZE 8
typedef struct {
// there are nheap items on the heap indexed 1..nheap (i.e., top of
// heap is 1). The 0th slot is unused - a marker is put there to check
// for overwrite errs.
int64_t h[HEAP_SIZE+1];
int nheap;
} pts_heap_t;
struct hb_work_private_s
{
hb_job_t *job;
hb_title_t *title;
AVCodecContext *context;
AVCodecParserContext *parser;
int threads;
int video_codec_opened;
hb_list_t *list;
double duration; // frame duration (for video)
double field_duration; // field duration (for video)
int frame_duration_set; // Indicates valid timing was found in stream
double pts_next; // next pts we expect to generate
int64_t chap_time; // time of next chap mark (if new_chap != 0)
int new_chap; // output chapter mark pending
uint32_t nframes;
uint32_t ndrops;
uint32_t decode_errors;
int brokenByMicrosoft; // video stream may contain packed b-frames
hb_buffer_t* delayq[HEAP_SIZE];
int queue_primed;
pts_heap_t pts_heap;
void* buffer;
struct SwsContext *sws_context; // if we have to rescale or convert color space
int sws_width;
int sws_height;
int sws_pix_fmt;
hb_downmix_t *downmix;
int cadence[12];
int wait_for_keyframe;
};
static void decodeAudio( hb_audio_t * audio, hb_work_private_t *pv, uint8_t *data, int size, int64_t pts );
static hb_buffer_t *link_buf_list( hb_work_private_t *pv );
static int64_t heap_pop( pts_heap_t *heap )
{
int64_t result;
if ( heap->nheap <= 0 )
{
return -1;
}
// return the top of the heap then put the bottom element on top,
// decrease the heap size by one & rebalence the heap.
result = heap->h[1];
int64_t v = heap->h[heap->nheap--];
int parent = 1;
int child = parent << 1;
while ( child <= heap->nheap )
{
// find the smallest of the two children of parent
if (child < heap->nheap && heap->h[child] > heap->h[child+1] )
++child;
if (v <= heap->h[child])
// new item is smaller than either child so it's the new parent.
break;
// smallest child is smaller than new item so move it up then
// check its children.
int64_t hp = heap->h[child];
heap->h[parent] = hp;
parent = child;
child = parent << 1;
}
heap->h[parent] = v;
return result;
}
static void heap_push( pts_heap_t *heap, int64_t v )
{
if ( heap->nheap < HEAP_SIZE )
{
++heap->nheap;
}
// stick the new value on the bottom of the heap then bubble it
// up to its correct spot.
int child = heap->nheap;
while (child > 1) {
int parent = child >> 1;
if (heap->h[parent] <= v)
break;
// move parent down
int64_t hp = heap->h[parent];
heap->h[child] = hp;
child = parent;
}
heap->h[child] = v;
}
/***********************************************************************
* hb_work_decavcodec_init
***********************************************************************
*
**********************************************************************/
static int decavcodecaInit( hb_work_object_t * w, hb_job_t * job )
{
AVCodec * codec;
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
pv->job = job;
if ( job )
pv->title = job->title;
else
pv->title = w->title;
pv->list = hb_list_init();
int codec_id = w->codec_param;
/*XXX*/
if ( codec_id == 0 )
codec_id = CODEC_ID_MP2;
codec = avcodec_find_decoder( codec_id );
if ( pv->title->opaque_priv )
{
AVFormatContext *ic = (AVFormatContext*)pv->title->opaque_priv;
pv->context = avcodec_alloc_context3(codec);
avcodec_copy_context( pv->context, ic->streams[w->audio->id]->codec);
hb_ff_set_sample_fmt( pv->context, codec );
}
else
{
pv->parser = av_parser_init( codec_id );
pv->context = avcodec_alloc_context3(codec);
hb_ff_set_sample_fmt( pv->context, codec );
}
if ( hb_avcodec_open( pv->context, codec, NULL, 0 ) )
{
hb_log( "decavcodecaInit: avcodec_open failed" );
return 1;
}
// DTS: work around lack of 6.0/6.1 support in libhb
if (hb_ff_dts_disable_xch(pv->context))
{
hb_deep_log(2, "decavcodecaInit: found DTS-ES, requesting DTS core");
}
else if ((!pv->context->channels || !pv->context->channel_layout) &&
(w->audio->config.in.codec == HB_ACODEC_DCA_HD) &&
((w->audio->config.in.channel_layout & ~AV_CH_LOW_FREQUENCY) == AV_CH_LAYOUT_5POINT0))
{
/* XXX: when we are demuxing the stream ourselves, it seems we have no
* channel count/layout info in the context until we decode audio for
* the first time. If the scan info says the source is 5.0 or 5.1,
* make sure XCh processing is disabled in Libav before decoding. */
pv->context->request_channels = pv->context->channels =
av_get_channel_layout_nb_channels(w->audio->config.in.channel_layout);
pv->context->channel_layout = w->audio->config.in.channel_layout;
hb_deep_log(2, "decavcodecaInit: scan detected DTS 5.0/5.1, disabling XCh processing");
}
if ( w->audio != NULL )
{
if ( hb_need_downmix( w->audio->config.in.channel_layout,
w->audio->config.out.mixdown) )
{
pv->downmix = hb_downmix_init(w->audio->config.in.channel_layout,
w->audio->config.out.mixdown);
hb_downmix_set_chan_map( pv->downmix, &hb_smpte_chan_map, &hb_smpte_chan_map );
}
}
return 0;
}
/***********************************************************************
* Close
***********************************************************************
*
**********************************************************************/
static void closePrivData( hb_work_private_t ** ppv )
{
hb_work_private_t * pv = *ppv;
if ( pv )
{
flushDelayQueue( pv );
if ( pv->job && pv->context && pv->context->codec )
{
hb_log( "%s-decoder done: %u frames, %u decoder errors, %u drops",
pv->context->codec->name, pv->nframes, pv->decode_errors,
pv->ndrops );
}
if ( pv->sws_context )
{
sws_freeContext( pv->sws_context );
}
if ( pv->parser )
{
av_parser_close(pv->parser);
}
if ( pv->context && pv->context->codec )
{
hb_avcodec_close( pv->context );
}
if ( pv->context )
{
av_free( pv->context );
}
if ( pv->list )
{
hb_list_empty( &pv->list );
}
if ( pv->buffer )
{
av_free( pv->buffer );
pv->buffer = NULL;
}
if ( pv->downmix )
{
hb_downmix_close( &(pv->downmix) );
}
free( pv );
}
*ppv = NULL;
}
static void decavcodecClose( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
if ( pv )
{
closePrivData( &pv );
w->private_data = NULL;
}
}
/***********************************************************************
* Work
***********************************************************************
*
**********************************************************************/
static int decavcodecaWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_buffer_t * in = *buf_in;
if ( in->size <= 0 )
{
/* EOF on input stream - send it downstream & say that we're done */
*buf_out = in;
*buf_in = NULL;
return HB_WORK_DONE;
}
*buf_out = NULL;
if ( in->s.start < -1 && pv->pts_next <= 0 )
{
// discard buffers that start before video time 0
return HB_WORK_OK;
}
int pos, len;
for ( pos = 0; pos < in->size; pos += len )
{
uint8_t *pout;
int pout_len;
int64_t cur;
cur = in->s.start;
if ( pv->parser != NULL )
{
len = av_parser_parse2( pv->parser, pv->context, &pout, &pout_len,
in->data + pos, in->size - pos, cur, cur, 0 );
cur = pv->parser->pts;
if ( cur == AV_NOPTS_VALUE )
cur = -1;
}
else
{
pout = in->data;
len = pout_len = in->size;
}
if (pout)
{
// set the duration on every frame since the stream format can
// change (it shouldn't but there's no way to guarantee it).
// duration is a scaling factor to go from #bytes in the decoded
// frame to frame time (in 90KHz mpeg ticks). 'channels' converts
// total samples to per-channel samples. 'sample_rate' converts
// per-channel samples to seconds per sample and the 90000
// is mpeg ticks per second.
if ( pv->context->sample_rate && pv->context->channels )
{
pv->duration = 90000. /
(double)( pv->context->sample_rate * pv->context->channels );
}
decodeAudio( w->audio, pv, pout, pout_len, cur );
}
}
*buf_out = link_buf_list( pv );
return HB_WORK_OK;
}
static int decavcodecaInfo( hb_work_object_t *w, hb_work_info_t *info )
{
hb_work_private_t *pv = w->private_data;
memset( info, 0, sizeof(*info) );
if ( pv && pv->context )
{
AVCodecContext *context = pv->context;
info->bitrate = context->bit_rate;
info->rate = context->time_base.num;
info->rate_base = context->time_base.den;
info->profile = context->profile;
info->level = context->level;
return 1;
}
return 0;
}
static int decavcodecaBSInfo( hb_work_object_t *w, const hb_buffer_t *buf,
hb_work_info_t *info )
{
hb_work_private_t *pv = w->private_data;
int ret = 0;
memset( info, 0, sizeof(*info) );
if ( pv && pv->context )
{
return decavcodecaInfo( w, info );
}
// XXX
// We should parse the bitstream to find its parameters but for right
// now we just return dummy values if there's a codec that will handle it.
AVCodec *codec = avcodec_find_decoder( w->codec_param? w->codec_param :
CODEC_ID_MP2 );
if ( ! codec )
{
// there's no ffmpeg codec for this audio type - give up
return -1;
}
static char codec_name[64];
info->name = strncpy( codec_name, codec->name, sizeof(codec_name)-1 );
AVCodecParserContext *parser = av_parser_init( codec->id );
AVCodecContext *context = avcodec_alloc_context3(codec);
hb_ff_set_sample_fmt( context, codec );
if ( hb_avcodec_open( context, codec, NULL, 0 ) )
{
return -1;
}
uint8_t *buffer = av_malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
int out_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
unsigned char *pbuffer;
int pos, pbuffer_size;
while ( buf && !ret )
{
pos = 0;
while ( pos < buf->size )
{
int len;
if ( parser != NULL )
{
len = av_parser_parse2( parser, context, &pbuffer,
&pbuffer_size, buf->data + pos,
buf->size - pos, buf->s.start,
buf->s.start, 0 );
}
else
{
pbuffer = buf->data;
len = pbuffer_size = buf->size;
}
pos += len;
if ( pbuffer_size > 0 )
{
AVPacket avp;
av_init_packet( &avp );
avp.data = pbuffer;
avp.size = pbuffer_size;
len = avcodec_decode_audio3( context, (int16_t*)buffer,
&out_size, &avp );
if ( len > 0 && context->sample_rate > 0 )
{
// DTS: work around lack of 6.0/6.1 support in libhb
if( hb_ff_dts_disable_xch( context ) )
{
hb_deep_log( 2, "decavcodecaBSInfo: found DTS-ES, requesting DTS core" );
}
int isamp = av_get_bytes_per_sample( context->sample_fmt );
info->bitrate = context->bit_rate;
info->rate = context->sample_rate;
info->rate_base = 1;
info->channel_layout =
hb_ff_layout_xlat(context->channel_layout,
context->channels);
ret = 1;
if ( context->channels && isamp )
{
info->samples_per_frame = out_size /
(isamp * context->channels);
}
break;
}
}
}
buf = buf->next;
}
info->profile = context->profile;
info->level = context->level;
info->channel_map = &hb_smpte_chan_map;
av_free( buffer );
if ( parser != NULL )
av_parser_close( parser );
hb_avcodec_close( context );
av_free( context );
return ret;
}
/* -------------------------------------------------------------
* General purpose video decoder using libavcodec
*/
static uint8_t *copy_plane( uint8_t *dst, uint8_t* src, int dstride, int sstride,
int h )
{
if ( dstride == sstride )
{
memcpy( dst, src, dstride * h );
return dst + dstride * h;
}
int lbytes = dstride <= sstride? dstride : sstride;
while ( --h >= 0 )
{
memcpy( dst, src, lbytes );
src += sstride;
dst += dstride;
}
return dst;
}
// copy one video frame into an HB buf. If the frame isn't in our color space
// or at least one of its dimensions is odd, use sws_scale to convert/rescale it.
// Otherwise just copy the bits.
static hb_buffer_t *copy_frame( hb_work_private_t *pv, AVFrame *frame )
{
AVCodecContext *context = pv->context;
int w, h;
if ( ! pv->job )
{
// HandBrake's video pipeline uses yuv420 color. This means all
// dimensions must be even. So we must adjust the dimensions
// of incoming video if not even.
w = context->width & ~1;
h = context->height & ~1;
}
else
{
w = pv->job->title->width;
h = pv->job->title->height;
}
hb_buffer_t *buf = hb_video_buffer_init( w, h );
uint8_t *dst = buf->data;
if ( context->pix_fmt != PIX_FMT_YUV420P || w != context->width ||
h != context->height )
{
// have to convert to our internal color space and/or rescale
AVPicture dstpic;
hb_avpicture_fill( &dstpic, buf );
if ( ! pv->sws_context ||
pv->sws_width != context->width ||
pv->sws_height != context->height ||
pv->sws_pix_fmt != context->pix_fmt )
{
if( pv->sws_context )
sws_freeContext( pv->sws_context );
pv->sws_context = hb_sws_get_context(
context->width, context->height, context->pix_fmt,
w, h, PIX_FMT_YUV420P,
SWS_LANCZOS|SWS_ACCURATE_RND);
pv->sws_width = context->width;
pv->sws_height = context->height;
pv->sws_pix_fmt = context->pix_fmt;
}
sws_scale( pv->sws_context, (const uint8_t* const *)frame->data,
frame->linesize, 0, context->height,
dstpic.data, dstpic.linesize );
}
else
{
w = buf->plane[0].stride;
h = buf->plane[0].height;
dst = copy_plane( dst, frame->data[0], w, frame->linesize[0], h );
w = buf->plane[1].stride;
h = buf->plane[1].height;
dst = copy_plane( dst, frame->data[1], w, frame->linesize[1], h );
w = buf->plane[2].stride;
h = buf->plane[2].height;
dst = copy_plane( dst, frame->data[2], w, frame->linesize[2], h );
}
return buf;
}
static int get_frame_buf( AVCodecContext *context, AVFrame *frame )
{
return avcodec_default_get_buffer( context, frame );
}
static int reget_frame_buf( AVCodecContext *context, AVFrame *frame )
{
return avcodec_default_reget_buffer( context, frame );
}
static void log_chapter( hb_work_private_t *pv, int chap_num, int64_t pts )
{
hb_chapter_t *c;
if ( !pv->job )
return;
c = hb_list_item( pv->job->title->list_chapter, chap_num - 1 );
if ( c && c->title )
{
hb_log( "%s: \"%s\" (%d) at frame %u time %"PRId64,
pv->context->codec->name, c->title, chap_num, pv->nframes, pts );
}
else
{
hb_log( "%s: Chapter %d at frame %u time %"PRId64,
pv->context->codec->name, chap_num, pv->nframes, pts );
}
}
static void flushDelayQueue( hb_work_private_t *pv )
{
hb_buffer_t *buf;
int slot = pv->queue_primed ? pv->nframes & (HEAP_SIZE-1) : 0;
// flush all the video packets left on our timestamp-reordering delay q
while ( ( buf = pv->delayq[slot] ) != NULL )
{
buf->s.start = heap_pop( &pv->pts_heap );
hb_list_add( pv->list, buf );
pv->delayq[slot] = NULL;
slot = ( slot + 1 ) & (HEAP_SIZE-1);
}
}
#define TOP_FIRST PIC_FLAG_TOP_FIELD_FIRST
#define PROGRESSIVE PIC_FLAG_PROGRESSIVE_FRAME
#define REPEAT_FIRST PIC_FLAG_REPEAT_FIRST_FIELD
#define TB 8
#define BT 16
#define BT_PROG 32
#define BTB_PROG 64
#define TB_PROG 128
#define TBT_PROG 256
static void checkCadence( int * cadence, uint16_t flags, int64_t start )
{
/* Rotate the cadence tracking. */
int i = 0;
for(i=11; i > 0; i--)
{
cadence[i] = cadence[i-1];
}
if ( !(flags & PROGRESSIVE) && !(flags & TOP_FIRST) )
{
/* Not progressive, not top first...
That means it's probably bottom
first, 2 fields displayed.
*/
//hb_log("MPEG2 Flag: Bottom field first, 2 fields displayed.");
cadence[0] = BT;
}
else if ( !(flags & PROGRESSIVE) && (flags & TOP_FIRST) )
{
/* Not progressive, top is first,
Two fields displayed.
*/
//hb_log("MPEG2 Flag: Top field first, 2 fields displayed.");
cadence[0] = TB;
}
else if ( (flags & PROGRESSIVE) && !(flags & TOP_FIRST) && !( flags & REPEAT_FIRST ) )
{
/* Progressive, but noting else.
That means Bottom first,
2 fields displayed.
*/
//hb_log("MPEG2 Flag: Progressive. Bottom field first, 2 fields displayed.");
cadence[0] = BT_PROG;
}
else if ( (flags & PROGRESSIVE) && !(flags & TOP_FIRST) && ( flags & REPEAT_FIRST ) )
{
/* Progressive, and repeat. .
That means Bottom first,
3 fields displayed.
*/
//hb_log("MPEG2 Flag: Progressive repeat. Bottom field first, 3 fields displayed.");
cadence[0] = BTB_PROG;
}
else if ( (flags & PROGRESSIVE) && (flags & TOP_FIRST) && !( flags & REPEAT_FIRST ) )
{
/* Progressive, top first.
That means top first,
2 fields displayed.
*/
//hb_log("MPEG2 Flag: Progressive. Top field first, 2 fields displayed.");
cadence[0] = TB_PROG;
}
else if ( (flags & PROGRESSIVE) && (flags & TOP_FIRST) && ( flags & REPEAT_FIRST ) )
{
/* Progressive, top, repeat.
That means top first,
3 fields displayed.
*/
//hb_log("MPEG2 Flag: Progressive repeat. Top field first, 3 fields displayed.");
cadence[0] = TBT_PROG;
}
if ( (cadence[2] <= TB) && (cadence[1] <= TB) && (cadence[0] > TB) && (cadence[11]) )
hb_log("%fs: Video -> Film", (float)start / 90000);
if ( (cadence[2] > TB) && (cadence[1] <= TB) && (cadence[0] <= TB) && (cadence[11]) )
hb_log("%fs: Film -> Video", (float)start / 90000);
}
/*
* Decodes a video frame from the specified raw packet data
* ('data', 'size', 'sequence').
* The output of this function is stored in 'pv->list', which contains a list
* of zero or more decoded packets.
*
* The returned packets are guaranteed to have their timestamps in the correct
* order, even if the original packets decoded by libavcodec have misordered
* timestamps, due to the use of 'packed B-frames'.
*
* Internally the set of decoded packets may be buffered in 'pv->delayq'
* until enough packets have been decoded so that the timestamps can be
* correctly rewritten, if this is necessary.
*/
static int decodeFrame( hb_work_object_t *w, uint8_t *data, int size, int sequence, int64_t pts, int64_t dts )
{
hb_work_private_t *pv = w->private_data;
int got_picture, oldlevel = 0;
AVFrame frame;
AVPacket avp;
if ( global_verbosity_level <= 1 )
{
oldlevel = av_log_get_level();
av_log_set_level( AV_LOG_QUIET );
}
av_init_packet( &avp );
avp.data = data;
avp.size = size;
avp.pts = pts;
avp.dts = dts;
if ( avcodec_decode_video2( pv->context, &frame, &got_picture, &avp ) < 0 )
{
++pv->decode_errors;
}
if ( global_verbosity_level <= 1 )
{
av_log_set_level( oldlevel );
}
if( got_picture && pv->wait_for_keyframe > 0 )
{
// Libav is inconsistant about how it flags keyframes. For many
// codecs it simply sets frame.key_frame. But for others, it only
// sets frame.pict_type. And for yet others neither gets set at all
// (qtrle).
int key = frame.key_frame ||
( w->codec_param != CODEC_ID_H264 &&
( frame.pict_type == AV_PICTURE_TYPE_I ||
frame.pict_type == 0 ) );
if( !key )
{
pv->wait_for_keyframe--;
return 0;
}
pv->wait_for_keyframe = 0;
}
if( got_picture )
{
uint16_t flags = 0;
// ffmpeg makes it hard to attach a pts to a frame. if the MPEG ES
// packet had a pts we handed it to av_parser_parse (if the packet had
// no pts we set it to AV_NOPTS_VALUE, but before the parse we can't
// distinguish between the start of a video frame with no pts & an
// intermediate packet of some frame which never has a pts). we hope
// that when parse returns the frame to us the pts we originally
// handed it will be in parser->pts. we put this pts into avp.pts so
// that when avcodec_decode_video finally gets around to allocating an
// AVFrame to hold the decoded frame, avcodec_default_get_buffer can
// stuff that pts into the it. if all of these relays worked at this
// point frame.pts should hold the frame's pts from the original data
// stream or AV_NOPTS_VALUE if it didn't have one. in the latter case
// we generate the next pts in sequence for it.
if ( !pv->frame_duration_set )
compute_frame_duration( pv );
double frame_dur = pv->duration;
if ( frame.repeat_pict )
{
frame_dur += frame.repeat_pict * pv->field_duration;
}
// If there was no pts for this frame, assume constant frame rate
// video & estimate the next frame time from the last & duration.
double pts;
if (frame.pkt_pts == AV_NOPTS_VALUE)
{
pts = pv->pts_next;
}
else
{
pts = frame.pkt_pts;
}
pv->pts_next = pts + frame_dur;
if ( frame.top_field_first )
{
flags |= PIC_FLAG_TOP_FIELD_FIRST;
}
if ( !frame.interlaced_frame )
{
flags |= PIC_FLAG_PROGRESSIVE_FRAME;
}
if ( frame.repeat_pict == 1 )
{
flags |= PIC_FLAG_REPEAT_FIRST_FIELD;
}
if ( frame.repeat_pict == 2 )
{
flags |= PIC_FLAG_REPEAT_FRAME;
}
hb_buffer_t *buf;
// if we're doing a scan or this content couldn't have been broken
// by Microsoft we don't worry about timestamp reordering
if ( ! pv->job || ! pv->brokenByMicrosoft )
{
buf = copy_frame( pv, &frame );
buf->s.start = pts;
buf->sequence = sequence;
buf->s.flags = flags;
if ( pv->new_chap && buf->s.start >= pv->chap_time )
{
buf->s.new_chap = pv->new_chap;
log_chapter( pv, pv->new_chap, buf->s.start );
pv->new_chap = 0;
pv->chap_time = 0;
}
else if ( pv->nframes == 0 && pv->job )
{
log_chapter( pv, pv->job->chapter_start, buf->s.start );
}
checkCadence( pv->cadence, flags, buf->s.start );
hb_list_add( pv->list, buf );
++pv->nframes;
return got_picture;
}
// XXX This following probably addresses a libavcodec bug but I don't
// see an easy fix so we workaround it here.
//
// The M$ 'packed B-frames' atrocity results in decoded frames with
// the wrong timestamp. E.g., if there are 2 b-frames the timestamps
// we see here will be "2 3 1 5 6 4 ..." instead of "1 2 3 4 5 6".
// The frames are actually delivered in the right order but with
// the wrong timestamp. To get the correct timestamp attached to
// each frame we have a delay queue (longer than the max number of
// b-frames) & a sorting heap for the timestamps. As each frame
// comes out of the decoder the oldest frame in the queue is removed
// and associated with the smallest timestamp. Then the new frame is
// added to the queue & its timestamp is pushed on the heap.
// This does nothing if the timestamps are correct (i.e., the video
// uses a codec that Micro$oft hasn't broken yet) but the frames
// get timestamped correctly even when M$ has munged them.
// remove the oldest picture from the frame queue (if any) &
// give it the smallest timestamp from our heap. The queue size
// is a power of two so we get the slot of the oldest by masking
// the frame count & this will become the slot of the newest
// once we've removed & processed the oldest.
int slot = pv->nframes & (HEAP_SIZE-1);
if ( ( buf = pv->delayq[slot] ) != NULL )
{
pv->queue_primed = 1;
buf->s.start = heap_pop( &pv->pts_heap );
if ( pv->new_chap && buf->s.start >= pv->chap_time )
{
buf->s.new_chap = pv->new_chap;
log_chapter( pv, pv->new_chap, buf->s.start );
pv->new_chap = 0;
pv->chap_time = 0;
}
else if ( pv->nframes == 0 && pv->job )
{
log_chapter( pv, pv->job->chapter_start, buf->s.start );
}
checkCadence( pv->cadence, buf->s.flags, buf->s.start );
hb_list_add( pv->list, buf );
}
// add the new frame to the delayq & push its timestamp on the heap
buf = copy_frame( pv, &frame );
buf->sequence = sequence;
/* Store picture flags for later use by filters */
buf->s.flags = flags;
pv->delayq[slot] = buf;
heap_push( &pv->pts_heap, pts );
++pv->nframes;
}
return got_picture;
}
static void decodeVideo( hb_work_object_t *w, uint8_t *data, int size, int sequence, int64_t pts, int64_t dts )
{
hb_work_private_t *pv = w->private_data;
/*
* The following loop is a do..while because we need to handle both
* data & the flush at the end (signaled by size=0). At the end there's
* generally a frame in the parser & one or more frames in the decoder
* (depending on the bframes setting).
*/
int pos = 0;
do {
uint8_t *pout;
int pout_len, len;
int64_t parser_pts, parser_dts;
if ( pv->parser )
{
len = av_parser_parse2( pv->parser, pv->context, &pout, &pout_len,
data + pos, size - pos, pts, dts, 0 );
parser_pts = pv->parser->pts;
parser_dts = pv->parser->dts;
}
else
{
pout = data;
len = pout_len = size;
parser_pts = pts;
parser_dts = dts;
}
pos += len;
if ( pout_len > 0 )
{
decodeFrame( w, pout, pout_len, sequence, parser_pts, parser_dts );
}
} while ( pos < size );
/* the stuff above flushed the parser, now flush the decoder */
if ( size <= 0 )
{
while ( decodeFrame( w, NULL, 0, sequence, AV_NOPTS_VALUE, AV_NOPTS_VALUE ) )
{
}
flushDelayQueue( pv );
}
}
/*
* Removes all packets from 'pv->list', links them together into
* a linked-list, and returns the first packet in the list.
*/
static hb_buffer_t *link_buf_list( hb_work_private_t *pv )
{
hb_buffer_t *head = hb_list_item( pv->list, 0 );
if ( head )
{
hb_list_rem( pv->list, head );
hb_buffer_t *last = head, *buf;
while ( ( buf = hb_list_item( pv->list, 0 ) ) != NULL )
{
hb_list_rem( pv->list, buf );
last->next = buf;
last = buf;
}
}
return head;
}
static void init_video_avcodec_context( hb_work_private_t *pv )
{
/* we have to wrap ffmpeg's get_buffer to be able to set the pts (?!) */
pv->context->opaque = pv;
pv->context->get_buffer = get_frame_buf;
pv->context->reget_buffer = reget_frame_buf;
}
static int decavcodecvInit( hb_work_object_t * w, hb_job_t * job )
{
hb_work_private_t *pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
pv->wait_for_keyframe = 60;
pv->job = job;