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ProRes Decoder

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Signed-off-by: Elvis Presley <elvis@e.p>
This commit is contained in:
Elvis Presley 2011-09-15 05:50:44 +02:00
parent d55b06b8e7
commit 5554de13b2
9 changed files with 625 additions and 2 deletions
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1
Changelog
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@ -53,6 +53,7 @@ easier to use. The changes are:
- WTV muxer
- Optional C++ Support (needed for libstagefright)
- H.264 Decoding on Android via Stagefright
- Prores decoder
version 0.8:

3
doc/APIchanges
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@ -13,6 +13,9 @@ libavutil: 2011-04-18
API changes, most recent first:
2011-09-14 - xxxxxxx - lavc 53.14.0
Prores decoder.
2011-09-12 - xxxxxxx - lavfi 2.40.0
Change AVFilterBufferRefAudioProps.sample_rate type from uint32_t to int.

2
doc/general.texi
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@ -476,6 +476,8 @@ following image formats are supported:
@tab fourcc: VP80, encoding supported through external library libvpx
@item planar RGB @tab @tab X
@tab fourcc: 8BPS
@item Prores @tab @tab X
@tab fourcc: apch,apcn,apcs,apco
@item Q-team QPEG @tab @tab X
@tab fourccs: QPEG, Q1.0, Q1.1
@item QuickTime 8BPS video @tab @tab X

1
libavcodec/Makefile
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@ -307,6 +307,7 @@ OBJS-$(CONFIG_PNG_DECODER) += png.o pngdec.o
OBJS-$(CONFIG_PNG_ENCODER) += png.o pngenc.o
OBJS-$(CONFIG_PPM_DECODER) += pnmdec.o pnm.o
OBJS-$(CONFIG_PPM_ENCODER) += pnmenc.o pnm.o
OBJS-$(CONFIG_PRORES_DECODER) += proresdec.o
OBJS-$(CONFIG_PTX_DECODER) += ptx.o
OBJS-$(CONFIG_QCELP_DECODER) += qcelpdec.o celp_math.o \
celp_filters.o acelp_vectors.o \

1
libavcodec/allcodecs.c
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@ -172,6 +172,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (PICTOR, pictor);
REGISTER_ENCDEC (PNG, png);
REGISTER_ENCDEC (PPM, ppm);
REGISTER_DECODER (PRORES, prores);
REGISTER_DECODER (PTX, ptx);
REGISTER_DECODER (QDRAW, qdraw);
REGISTER_DECODER (QPEG, qpeg);

614
libavcodec/proresdec.c Normal file
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@ -0,0 +1,614 @@
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation;
* version 2 of the License.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU 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
*/
/**
* @file libavcodec/proresdec.c
* Known FOURCCs: 'apch' (HQ), 'apcn' (SD), 'apcs' (LT), 'acpo' (Proxy), 'ap4c' (4444)
*/
//#define DEBUG
#define A32_BITSTREAM_READER
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "simple_idct.h"
typedef struct {
const uint8_t *data;
unsigned mb_x;
unsigned mb_y;
unsigned mb_count;
unsigned data_size;
} SliceContext;
typedef struct {
AVFrame frame;
DSPContext dsp;
int frame_type; ///< 0 = progressive, 1 = tff, 2 = bff
uint8_t qmat_luma[64];
uint8_t qmat_chroma[64];
SliceContext *slices;
int slice_count; ///< number of slices in the current picture
unsigned mb_width; ///< width of the current picture in mb
unsigned mb_height; ///< height of the current picture in mb
uint8_t progressive_scan[64];
uint8_t interlaced_scan[64];
const uint8_t *scan;
int first_field;
void (*idct_put)(DCTELEM *, uint8_t *restrict, int);
} ProresContext;
static void permute(uint8_t *dst, const uint8_t *src, const uint8_t permutation[64])
{
int i;
for (i = 0; i < 64; i++)
dst[i] = permutation[src[i]];
}
static av_always_inline void put_pixels(const DCTELEM *block, uint8_t *restrict pixels, int stride)
{
int16_t *p = (int16_t*)pixels;
int i, j;
stride >>= 1;
for(i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
p[j] = av_clip(block[j], 4, 1019);
}
p += stride;
block += 8;
}
}
static void idct_put(DCTELEM *block, uint8_t *restrict pixels, int stride)
{
ff_simple_idct_10(block);
put_pixels(block, pixels, stride);
}
static const uint8_t progressive_scan[64] = {
0, 1, 8, 9, 2, 3, 10, 11,
16, 17, 24, 25, 18, 19, 26, 27,
4, 5, 12, 20, 13, 6, 7, 14,
21, 28, 29, 22, 15, 23, 30, 31,
32, 33, 40, 48, 41, 34, 35, 42,
49, 56, 57, 50, 43, 36, 37, 44,
51, 58, 59, 52, 45, 38, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63
};
static const uint8_t interlaced_scan[64] = {
0, 8, 1, 9, 16, 24, 17, 25,
2, 10, 3, 11, 18, 26, 19, 27,
32, 40, 33, 34, 41, 48, 56, 49,
42, 35, 43, 50, 57, 58, 51, 59,
4, 12, 5, 6, 13, 20, 28, 21,
14, 7, 15, 22, 29, 36, 44, 37,
30, 23, 31, 38, 45, 52, 60, 53,
46, 39, 47, 54, 61, 62, 55, 63,
};
static av_cold int decode_init(AVCodecContext *avctx)
{
ProresContext *ctx = avctx->priv_data;
avctx->bits_per_raw_sample = 10;
dsputil_init(&ctx->dsp, avctx);
avctx->coded_frame = &ctx->frame;
ctx->frame.type = FF_I_TYPE;
ctx->frame.key_frame = 1;
ctx->idct_put = idct_put;
memcpy(ctx->progressive_scan, progressive_scan, sizeof(progressive_scan));
memcpy(ctx->interlaced_scan, interlaced_scan, sizeof(interlaced_scan));
return 0;
}
static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
const int data_size, AVCodecContext *avctx)
{
int hdr_size, width, height, flags;
int version;
const uint8_t *ptr;
const uint8_t *scan;
hdr_size = AV_RB16(buf);
av_dlog(avctx, "header size %d\n", hdr_size);
if (hdr_size > data_size) {
av_log(avctx, AV_LOG_ERROR, "error, wrong header size\n");
return -1;
}
version = AV_RB16(buf + 2);
av_dlog(avctx, "%.4s version %d\n", buf+4, version);
if (version != 0) {
av_log(avctx, AV_LOG_ERROR, "unsupported version: %d\n", version);
return -1;
}
width = AV_RB16(buf + 8);
height = AV_RB16(buf + 10);
if (width != avctx->width || height != avctx->height) {
av_log(avctx, AV_LOG_ERROR, "picture resolution change: %dx%d -> %dx%d\n",
avctx->width, avctx->height, width, height);
return -1;
}
ctx->frame_type = (buf[12] >> 2) & 3;
av_dlog(avctx, "frame type %d\n", ctx->frame_type);
if (ctx->frame_type == 0) {
scan = progressive_scan;
ctx->scan = ctx->progressive_scan; // permuted
} else {
scan = interlaced_scan;
ctx->scan = ctx->interlaced_scan; // permuted
ctx->frame.interlaced_frame = 1;
ctx->frame.top_field_first = ctx->frame_type == 1;
}
avctx->pix_fmt = PIX_FMT_YUV422P10;
ptr = buf + 20;
flags = buf[19];
av_dlog(avctx, "flags %x\n", flags);
if (flags & 2) {
permute(ctx->qmat_luma, scan, ptr);
ptr += 64;
} else {
memset(ctx->qmat_luma, 4, 64);
}
if (flags & 1) {
permute(ctx->qmat_chroma, scan, ptr);
} else {
memset(ctx->qmat_chroma, 4, 64);
}
return hdr_size;
}
static int decode_picture_header(AVCodecContext *avctx, const uint8_t *buf, const int buf_size)
{
ProresContext *ctx = avctx->priv_data;
int i, hdr_size, slice_count;
unsigned pic_data_size;
int log2_slice_mb_width, log2_slice_mb_height;
int slice_mb_count, mb_x, mb_y;
const uint8_t *data_ptr, *index_ptr;
hdr_size = buf[0] >> 3;
if (hdr_size < 8 || hdr_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "error, wrong picture header size\n");
return -1;
}
pic_data_size = AV_RB32(buf + 1);
if (pic_data_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "error, wrong picture data size\n");
return -1;
}
log2_slice_mb_width = buf[7] >> 4;
log2_slice_mb_height = buf[7] & 0xF;
if (log2_slice_mb_width > 3 || log2_slice_mb_height) {
av_log(avctx, AV_LOG_ERROR, "unsupported slice resolution: %dx%d\n",
1 << log2_slice_mb_width, 1 << log2_slice_mb_height);
return -1;
}
ctx->mb_width = (avctx->width + 15) >> 4;
ctx->mb_height = (avctx->height + 15) >> 4;
slice_count = AV_RB16(buf + 5);
if (ctx->slice_count != slice_count || !ctx->slices) {
av_freep(&ctx->slices);
ctx->slices = av_mallocz(slice_count * sizeof(*ctx->slices));
if (!ctx->slices)
return AVERROR(ENOMEM);
ctx->slice_count = slice_count;
}
if (!slice_count)
return AVERROR(EINVAL);
if (hdr_size + slice_count*2 > buf_size) {
av_log(avctx, AV_LOG_ERROR, "error, wrong slice count\n");
return -1;
}
// parse slice information
index_ptr = buf + hdr_size;
data_ptr = index_ptr + slice_count*2;
slice_mb_count = 1 << log2_slice_mb_width;
mb_x = 0;
mb_y = 0;
for (i = 0; i < slice_count; i++) {
SliceContext *slice = &ctx->slices[i];
slice->data = data_ptr;
data_ptr += AV_RB16(index_ptr + i*2);
while (ctx->mb_width - mb_x < slice_mb_count)
slice_mb_count >>= 1;
slice->mb_x = mb_x;
slice->mb_y = mb_y;
slice->mb_count = slice_mb_count;
slice->data_size = data_ptr - slice->data;
if (slice->data_size < 6) {
av_log(avctx, AV_LOG_ERROR, "error, wrong slice data size\n");
return -1;
}
mb_x += slice_mb_count;
if (mb_x == ctx->mb_width) {
slice_mb_count = 1 << log2_slice_mb_width;
mb_x = 0;
mb_y++;
}
if (data_ptr > buf + buf_size) {
av_log(avctx, AV_LOG_ERROR, "error, slice out of bounds\n");
return -1;
}
}
return pic_data_size;
}
#define DECODE_CODEWORD(val, codebook) \
do { \
unsigned int rice_order, exp_order, switch_bits; \
unsigned int q, buf, bits; \
\
UPDATE_CACHE(re, gb); \
buf = GET_CACHE(re, gb); \
\
/* number of bits to switch between rice and exp golomb */ \
switch_bits = codebook & 3; \
rice_order = codebook >> 5; \
exp_order = (codebook >> 2) & 7; \
\
q = 31-av_log2(buf); \
\
if (q > switch_bits) { /* exp golomb */ \
bits = exp_order - switch_bits + (q<<1); \
val = SHOW_UBITS(re, gb, bits) - (1 << exp_order) + \
((switch_bits + 1) << rice_order); \
SKIP_BITS(re, gb, bits); \
} else if (rice_order) { \
SKIP_BITS(re, gb, q+1); \
val = (q << rice_order) + SHOW_UBITS(re, gb, rice_order); \
SKIP_BITS(re, gb, rice_order); \
} else { \
val = q; \
SKIP_BITS(re, gb, q+1); \
} \
} while (0); \
#define TOSIGNED(x) (((x) >> 1) ^ (-((x) & 1)))
#define FIRST_DC_CB 0xB8
static const uint8_t dc_codebook[7] = { 0x04, 0x28, 0x28, 0x4D, 0x4D, 0x70, 0x70};
static av_always_inline void decode_dc_coeffs(GetBitContext *gb, DCTELEM *out,
int blocks_per_slice, const int *qmat)
{
DCTELEM prev_dc;
int code, code2, i, sign;
OPEN_READER(re, gb);
DECODE_CODEWORD(code, FIRST_DC_CB);
prev_dc = TOSIGNED(code);
out[0] = 4096 + ((prev_dc * qmat[0]) >> 2);
out += 64; // dc coeff for the next block
code = 5;
sign = 0;
for (i = 1; i < blocks_per_slice; i++, out += 64) {
DECODE_CODEWORD(code, dc_codebook[FFMIN(code, 6)]);
if(code) sign ^= -(code & 1);
else sign = 0;
prev_dc += (((code + 1) >> 1) ^ sign) - sign;
out[0] = 4096 + ((prev_dc * qmat[0]) >> 2);
}
CLOSE_READER(re, gb);
}
// adaptive codebook switching lut according to previous run/level values
static const uint8_t run_to_cb[16] = { 0x06, 0x06, 0x05, 0x05, 0x04, 0x29, 0x29, 0x29, 0x29, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x4C };
static const uint8_t lev_to_cb[10] = { 0x04, 0x0A, 0x05, 0x06, 0x04, 0x28, 0x28, 0x28, 0x28, 0x4C };
static av_always_inline void decode_ac_coeffs(AVCodecContext *avctx, GetBitContext *gb,
DCTELEM *out, int blocks_per_slice,
const int *qmat)
{
ProresContext *ctx = avctx->priv_data;
int block_mask, sign;
unsigned pos, run, level;
int max_coeffs, i, bits_left;
int log2_block_count = av_log2(blocks_per_slice);
OPEN_READER(re, gb);
run = 4;
level = 2;
max_coeffs = 64 << log2_block_count;
block_mask = blocks_per_slice - 1;
for (pos = block_mask;;) {
bits_left = gb->size_in_bits - (((uint8_t*)re_buffer_ptr - gb->buffer)*8 - 32 + re_bit_count);
if (!bits_left || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
break;
DECODE_CODEWORD(run, run_to_cb[FFMIN(run, 15)]);
pos += run + 1;
if (pos >= max_coeffs) {
av_log(avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", pos, max_coeffs);
return;
}
DECODE_CODEWORD(level, lev_to_cb[FFMIN(level, 9)]);
level += 1;
i = pos >> log2_block_count;
sign = SHOW_SBITS(re, gb, 1);
SKIP_BITS(re, gb, 1);
out[((pos & block_mask) << 6) + ctx->scan[i]] = (((level ^ sign) - sign) * qmat[i]) >> 2;
}
CLOSE_READER(re, gb);
}
static void decode_slice_luma(AVCodecContext *avctx, SliceContext *slice,
uint8_t *dst, int dst_stride,
const uint8_t *buf, unsigned buf_size,
const int *qmat)
{
ProresContext *ctx = avctx->priv_data;
DECLARE_ALIGNED(16, DCTELEM, blocks)[8*4*64], *block;
GetBitContext gb;
int i, blocks_per_slice = slice->mb_count<<2;
for (i = 0; i < blocks_per_slice; i++)
ctx->dsp.clear_block(blocks+(i<<6));
init_get_bits(&gb, buf, buf_size << 3);
decode_dc_coeffs(&gb, blocks, blocks_per_slice, qmat);
decode_ac_coeffs(avctx, &gb, blocks, blocks_per_slice, qmat);
block = blocks;
for (i = 0; i < slice->mb_count; i++) {
ctx->idct_put(block+(0<<6), dst, dst_stride);
ctx->idct_put(block+(1<<6), dst+16, dst_stride);
ctx->idct_put(block+(2<<6), dst+8*dst_stride, dst_stride);
ctx->idct_put(block+(3<<6), dst+8*dst_stride+16, dst_stride);
block += 4*64;
dst += 32;
}
}
static void decode_slice_chroma(AVCodecContext *avctx, SliceContext *slice,
uint8_t *dst, int dst_stride,
const uint8_t *buf, unsigned buf_size,
const int *qmat)
{
ProresContext *ctx = avctx->priv_data;
DECLARE_ALIGNED(16, DCTELEM, blocks)[8*4*64], *block;
GetBitContext gb;
int i, blocks_per_slice = slice->mb_count*2;
for (i = 0; i < blocks_per_slice; i++)
ctx->dsp.clear_block(blocks+(i<<6));
init_get_bits(&gb, buf, buf_size << 3);
decode_dc_coeffs(&gb, blocks, blocks_per_slice, qmat);
decode_ac_coeffs(avctx, &gb, blocks, blocks_per_slice, qmat);
block = blocks;
for (i = 0; i < slice->mb_count; i++) {
ctx->idct_put(block+(0<<6), dst, dst_stride);
ctx->idct_put(block+(1<<6), dst+8*dst_stride, dst_stride);
block += 2*64;
dst += 16;
}
}
static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)
{
ProresContext *ctx = avctx->priv_data;
SliceContext *slice = &ctx->slices[jobnr];
const uint8_t *buf = slice->data;
AVFrame *pic = avctx->coded_frame;
int i, hdr_size, qscale;
int luma_stride, chroma_stride;
int y_data_size, u_data_size, v_data_size;
uint8_t *dest_y, *dest_u, *dest_v;
int qmat_luma_scaled[64];
int qmat_chroma_scaled[64];
//av_log(avctx, AV_LOG_INFO, "slice %d mb width %d mb x %d y %d\n",
// jobnr, slice->mb_count, slice->mb_x, slice->mb_y);
// slice header
hdr_size = buf[0] >> 3;
qscale = av_clip(buf[1], 1, 224);
qscale = qscale > 128 ? qscale - 96 << 2: qscale;
y_data_size = AV_RB16(buf + 2);
u_data_size = AV_RB16(buf + 4);
v_data_size = slice->data_size - y_data_size - u_data_size - hdr_size;
if (y_data_size < 0 || u_data_size < 0 || v_data_size < 0) {
av_log(avctx, AV_LOG_ERROR, "invalid plane data size\n");
return -1;
}
buf += hdr_size;
for (i = 0; i < 64; i++) {
qmat_luma_scaled[i] = ctx->qmat_luma[i] * qscale;
qmat_chroma_scaled[i] = ctx->qmat_chroma[i] * qscale;
}
if (ctx->frame_type == 0) {
luma_stride = pic->linesize[0];
chroma_stride = pic->linesize[1];
} else {
luma_stride = pic->linesize[0] << 1;
chroma_stride = pic->linesize[1] << 1;
}
dest_y = pic->data[0] + (slice->mb_y << 4) * luma_stride + (slice->mb_x << 5);
dest_u = pic->data[1] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << 4);
dest_v = pic->data[2] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << 4);
if (ctx->frame_type && ctx->first_field ^ ctx->frame.top_field_first) {
dest_y += pic->linesize[0];
dest_u += pic->linesize[1];
dest_v += pic->linesize[2];
}
decode_slice_luma(avctx, slice, dest_y, luma_stride,
buf, y_data_size, qmat_luma_scaled);
if (!(avctx->flags & CODEC_FLAG_GRAY)) {
decode_slice_chroma(avctx, slice, dest_u, chroma_stride,
buf + y_data_size, u_data_size,
qmat_chroma_scaled);
decode_slice_chroma(avctx, slice, dest_v, chroma_stride,
buf + y_data_size + u_data_size, v_data_size,
qmat_chroma_scaled);
}
return 0;
}
static int decode_picture(AVCodecContext *avctx)
{
ProresContext *ctx = avctx->priv_data;
int i, threads_ret[ctx->slice_count];
avctx->execute2(avctx, decode_slice_thread, NULL, threads_ret, ctx->slice_count);
for (i = 0; i < ctx->slice_count; i++)
if (threads_ret[i] < 0)
return threads_ret[i];
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt)
{
ProresContext *ctx = avctx->priv_data;
AVFrame *frame = avctx->coded_frame;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int frame_hdr_size, pic_size;
if (buf_size < 28 || buf_size != AV_RB32(buf) ||
AV_RL32(buf + 4) != AV_RL32("icpf")) {
av_log(avctx, AV_LOG_ERROR, "invalid frame header\n");
return -1;
}
ctx->first_field = 1;
buf += 8;
buf_size -= 8;
frame_hdr_size = decode_frame_header(ctx, buf, buf_size, avctx);
if (frame_hdr_size < 0)
return -1;
buf += frame_hdr_size;
buf_size -= frame_hdr_size;
decode_picture:
pic_size = decode_picture_header(avctx, buf, buf_size);
if (pic_size < 0) {
av_log(avctx, AV_LOG_ERROR, "error decoding picture header\n");
return -1;
}
if (frame->data[0])
avctx->release_buffer(avctx, frame);
if (avctx->get_buffer(avctx, frame) < 0)
return -1;
if (decode_picture(avctx)) {
av_log(avctx, AV_LOG_ERROR, "error decoding picture\n");
return -1;
}
buf += pic_size;
buf_size -= pic_size;
if (ctx->frame_type && buf_size > 0 && ctx->first_field) {
ctx->first_field = 0;
goto decode_picture;
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = *frame;
return avpkt->size;
}
static av_cold int decode_close(AVCodecContext *avctx)
{
ProresContext *ctx = avctx->priv_data;
AVFrame *frame = avctx->coded_frame;
if (frame->data[0])
avctx->release_buffer(avctx, frame);
av_freep(&ctx->slices);
return 0;
}
AVCodec ff_prores_decoder = {
.name = "prores",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_PRORES,
.priv_data_size = sizeof(ProresContext),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("ProRes"),
.capabilities = CODEC_CAP_SLICE_THREADS,
};

2
libavcodec/utils.c
View File

@ -149,7 +149,7 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int l
case PIX_FMT_YUV444P10BE:
w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
h_align= 16;
if(s->codec_id == CODEC_ID_MPEG2VIDEO || s->codec_id == CODEC_ID_MJPEG || s->codec_id == CODEC_ID_AMV || s->codec_id == CODEC_ID_THP || s->codec_id == CODEC_ID_H264)
if(s->codec_id == CODEC_ID_MPEG2VIDEO || s->codec_id == CODEC_ID_MJPEG || s->codec_id == CODEC_ID_AMV || s->codec_id == CODEC_ID_THP || s->codec_id == CODEC_ID_H264 || s->codec_id == CODEC_ID_PRORES)
h_align= 32; // interlaced is rounded up to 2 MBs
break;
case PIX_FMT_YUV411P:

2
libavcodec/version.h
View File

@ -21,7 +21,7 @@
#define AVCODEC_VERSION_H
#define LIBAVCODEC_VERSION_MAJOR 53
#define LIBAVCODEC_VERSION_MINOR 14
#define LIBAVCODEC_VERSION_MINOR 15
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \

1
libavformat/utils.c
View File

@ -896,6 +896,7 @@ static int is_intra_only(AVCodecContext *enc){
case CODEC_ID_VCR1:
case CODEC_ID_DNXHD:
case CODEC_ID_JPEG2000:
case CODEC_ID_PRORES:
return 1;
default: break;
}