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avcodec/mpegvideo: support disabling motion compensation

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This allows analyzing videos without having prior and current frames mixed

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-05-02 15:57:59 +02:00
parent 1ccd1a3860
commit c60b266eac
3 changed files with 47 additions and 0 deletions
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1
libavcodec/avcodec.h
View File

@ -2587,6 +2587,7 @@ typedef struct AVCodecContext {
#endif
#define FF_DEBUG_BUFFERS 0x00008000
#define FF_DEBUG_THREADS 0x00010000
#define FF_DEBUG_NOMC 0x01000000
#if FF_API_DEBUG_MV
/**

45
libavcodec/mpegvideo.c
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@ -340,6 +340,18 @@ static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
ff_MPV_decode_mb(s, s->block);
}
static void gray16(uint8_t *dst, uint8_t *src, int linesize, int h)
{
while(h--)
memset(dst + h*linesize, 128, 16);
}
static void gray8(uint8_t *dst, uint8_t *src, int linesize, int h)
{
while(h--)
memset(dst + h*linesize, 128, 8);
}
/* init common dct for both encoder and decoder */
av_cold int ff_dct_common_init(MpegEncContext *s)
{
@ -348,6 +360,19 @@ av_cold int ff_dct_common_init(MpegEncContext *s)
ff_hpeldsp_init(&s->hdsp, s->avctx->flags);
ff_videodsp_init(&s->vdsp, s->avctx->bits_per_raw_sample);
if (s->avctx->debug & FF_DEBUG_NOMC) {
int i;
for (i=0; i<4; i++) {
s->hdsp.avg_pixels_tab[0][i] = gray16;
s->hdsp.put_pixels_tab[0][i] = gray16;
s->hdsp.put_no_rnd_pixels_tab[0][i] = gray16;
s->hdsp.avg_pixels_tab[1][i] = gray8;
s->hdsp.put_pixels_tab[1][i] = gray8;
s->hdsp.put_no_rnd_pixels_tab[1][i] = gray8;
}
}
s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_c;
s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_c;
s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c;
@ -1656,6 +1681,22 @@ int ff_find_unused_picture(MpegEncContext *s, int shared)
return ret;
}
static void gray_frame(AVFrame *frame)
{
int i, h_chroma_shift, v_chroma_shift;
av_pix_fmt_get_chroma_sub_sample(frame->format, &h_chroma_shift, &v_chroma_shift);
for(i=0; i<frame->height; i++)
memset(frame->data[0] + frame->linesize[0]*i, 0x80, frame->width);
for(i=0; i<FF_CEIL_RSHIFT(frame->height, v_chroma_shift); i++) {
memset(frame->data[1] + frame->linesize[1]*i,
0x80, FF_CEIL_RSHIFT(frame->width, h_chroma_shift));
memset(frame->data[2] + frame->linesize[2]*i,
0x80, FF_CEIL_RSHIFT(frame->width, h_chroma_shift));
}
}
/**
* generic function called after decoding
* the header and before a frame is decoded.
@ -1882,6 +1923,10 @@ int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx)
s->dct_unquantize_inter = s->dct_unquantize_mpeg1_inter;
}
if (s->avctx->debug & FF_DEBUG_NOMC) {
gray_frame(s->current_picture_ptr->f);
}
return 0;
}

1
libavcodec/options_table.h
View File

@ -248,6 +248,7 @@ static const AVOption avcodec_options[] = {
{"vis_mb_type", "visualize block types", 0, AV_OPT_TYPE_CONST, {.i64 = FF_DEBUG_VIS_MB_TYPE }, INT_MIN, INT_MAX, V|D, "debug"},
{"buffers", "picture buffer allocations", 0, AV_OPT_TYPE_CONST, {.i64 = FF_DEBUG_BUFFERS }, INT_MIN, INT_MAX, V|D, "debug"},
{"thread_ops", "threading operations", 0, AV_OPT_TYPE_CONST, {.i64 = FF_DEBUG_THREADS }, INT_MIN, INT_MAX, V|A|D, "debug"},
{"nomc", "skip motion compensation", 0, AV_OPT_TYPE_CONST, {.i64 = FF_DEBUG_NOMC }, INT_MIN, INT_MAX, V|A|D, "debug"},
{"vismv", "visualize motion vectors (MVs)", OFFSET(debug_mv), AV_OPT_TYPE_INT, {.i64 = DEFAULT }, 0, INT_MAX, V|D, "debug_mv"},
{"pf", "forward predicted MVs of P-frames", 0, AV_OPT_TYPE_CONST, {.i64 = FF_DEBUG_VIS_MV_P_FOR }, INT_MIN, INT_MAX, V|D, "debug_mv"},
{"bf", "forward predicted MVs of B-frames", 0, AV_OPT_TYPE_CONST, {.i64 = FF_DEBUG_VIS_MV_B_FOR }, INT_MIN, INT_MAX, V|D, "debug_mv"},