/*
* DV decoder
- * Copyright (c) 2002 Fabrice Bellard.
+ * Copyright (c) 2002 Fabrice Bellard
+ * Copyright (c) 2004 Roman Shaposhnik
*
- * DV encoder
- * Copyright (c) 2003 Roman Shaposhnik.
+ * DV encoder
+ * Copyright (c) 2003 Roman Shaposhnik
+ *
+ * 50 Mbps (DVCPRO50) support
+ * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
+ *
+ * 100 Mbps (DVCPRO HD) support
+ * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
+ * Final code by Roman Shaposhnik
*
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
* of DV technical info.
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file dv.c
+ * @file
* DV codec.
*/
+
+#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "dsputil.h"
-#include "mpegvideo.h"
+#include "get_bits.h"
+#include "internal.h"
+#include "put_bits.h"
#include "simple_idct.h"
#include "dvdata.h"
+#include "dv_tablegen.h"
-typedef struct DVVideoDecodeContext {
- const DVprofile* sys;
- AVFrame picture;
-
- uint8_t dv_zigzag[2][64];
- uint8_t dv_idct_shift[2][22][64];
- uint8_t dv_dct_shift[2][22][64];
-
- void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
- void (*fdct[2])(DCTELEM *block);
- void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
-
- GetBitContext gb;
- DCTELEM block[5*6][64] __align8;
-} DVVideoDecodeContext;
-
-#define TEX_VLC_BITS 9
/* XXX: also include quantization */
-static RL_VLC_ELEM *dv_rl_vlc[1];
-static VLC_TYPE dv_vlc_codes[15][23];
+RL_VLC_ELEM ff_dv_rl_vlc[1184];
-static void dv_build_unquantize_tables(DVVideoDecodeContext *s, uint8_t* perm)
+static inline void dv_calc_mb_coordinates(const DVprofile *d, int chan, int seq, int slot,
+ uint16_t *tbl)
{
- int i, q, j;
-
- /* NOTE: max left shift is 6 */
- for(q = 0; q < 22; q++) {
- /* 88DCT */
- for(i = 1; i < 64; i++) {
- /* 88 table */
- j = perm[i];
- s->dv_idct_shift[0][q][j] =
- dv_quant_shifts[q][dv_88_areas[i]] + 1;
- s->dv_dct_shift[0][q][i] =
- dv_quant_shifts[q][dv_88_areas[ff_zigzag_direct[i]]] + 4;
+ static const uint8_t off[] = { 2, 6, 8, 0, 4 };
+ static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
+ static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
+ static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 };
+
+ static const uint8_t l_start[] = {0, 4, 9, 13, 18, 22, 27, 31, 36, 40};
+ static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };
+
+ static const uint8_t serpent1[] = {0, 1, 2, 2, 1, 0,
+ 0, 1, 2, 2, 1, 0,
+ 0, 1, 2, 2, 1, 0,
+ 0, 1, 2, 2, 1, 0,
+ 0, 1, 2};
+ static const uint8_t serpent2[] = {0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
+ 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
+ 0, 1, 2, 3, 4, 5};
+
+ static const uint8_t remap[][2] = {{ 0, 0}, { 0, 0}, { 0, 0}, { 0, 0}, /* dummy */
+ { 0, 0}, { 0, 1}, { 0, 2}, { 0, 3}, {10, 0},
+ {10, 1}, {10, 2}, {10, 3}, {20, 0}, {20, 1},
+ {20, 2}, {20, 3}, {30, 0}, {30, 1}, {30, 2},
+ {30, 3}, {40, 0}, {40, 1}, {40, 2}, {40, 3},
+ {50, 0}, {50, 1}, {50, 2}, {50, 3}, {60, 0},
+ {60, 1}, {60, 2}, {60, 3}, {70, 0}, {70, 1},
+ {70, 2}, {70, 3}, { 0,64}, { 0,65}, { 0,66},
+ {10,64}, {10,65}, {10,66}, {20,64}, {20,65},
+ {20,66}, {30,64}, {30,65}, {30,66}, {40,64},
+ {40,65}, {40,66}, {50,64}, {50,65}, {50,66},
+ {60,64}, {60,65}, {60,66}, {70,64}, {70,65},
+ {70,66}, { 0,67}, {20,67}, {40,67}, {60,67}};
+
+ int i, k, m;
+ int x, y, blk;
+
+ for (m=0; m<5; m++) {
+ switch (d->width) {
+ case 1440:
+ blk = (chan*11+seq)*27+slot;
+
+ if (chan == 0 && seq == 11) {
+ x = m*27+slot;
+ if (x<90) {
+ y = 0;
+ } else {
+ x = (x - 90)*2;
+ y = 67;
+ }
+ } else {
+ i = (4*chan + blk + off[m])%11;
+ k = (blk/11)%27;
+
+ x = shuf1[m] + (chan&1)*9 + k%9;
+ y = (i*3+k/9)*2 + (chan>>1) + 1;
+ }
+ tbl[m] = (x<<1)|(y<<9);
+ break;
+ case 1280:
+ blk = (chan*10+seq)*27+slot;
+
+ i = (4*chan + (seq/5) + 2*blk + off[m])%10;
+ k = (blk/5)%27;
+
+ x = shuf1[m]+(chan&1)*9 + k%9;
+ y = (i*3+k/9)*2 + (chan>>1) + 4;
+
+ if (x >= 80) {
+ x = remap[y][0]+((x-80)<<(y>59));
+ y = remap[y][1];
+ }
+ tbl[m] = (x<<1)|(y<<9);
+ break;
+ case 960:
+ blk = (chan*10+seq)*27+slot;
+
+ i = (4*chan + (seq/5) + 2*blk + off[m])%10;
+ k = (blk/5)%27 + (i&1)*3;
+
+ x = shuf2[m] + k%6 + 6*(chan&1);
+ y = l_start[i] + k/6 + 45*(chan>>1);
+ tbl[m] = (x<<1)|(y<<9);
+ break;
+ case 720:
+ switch (d->pix_fmt) {
+ case PIX_FMT_YUV422P:
+ x = shuf3[m] + slot/3;
+ y = serpent1[slot] +
+ ((((seq + off[m]) % d->difseg_size)<<1) + chan)*3;
+ tbl[m] = (x<<1)|(y<<8);
+ break;
+ case PIX_FMT_YUV420P:
+ x = shuf3[m] + slot/3;
+ y = serpent1[slot] +
+ ((seq + off[m]) % d->difseg_size)*3;
+ tbl[m] = (x<<1)|(y<<9);
+ break;
+ case PIX_FMT_YUV411P:
+ i = (seq + off[m]) % d->difseg_size;
+ k = slot + ((m==1||m==2)?3:0);
+
+ x = l_start_shuffled[m] + k/6;
+ y = serpent2[k] + i*6;
+ if (x>21)
+ y = y*2 - i*6;
+ tbl[m] = (x<<2)|(y<<8);
+ break;
+ }
+ default:
+ break;
}
-
- /* 248DCT */
- for(i = 1; i < 64; i++) {
- /* 248 table */
- s->dv_idct_shift[1][q][i] =
- dv_quant_shifts[q][dv_248_areas[i]] + 1;
- s->dv_dct_shift[1][q][i] =
- dv_quant_shifts[q][dv_248_areas[ff_zigzag248_direct[i]]] + 4;
+ }
+}
+
+/* quantization quanta by QNO for DV100 */
+static const uint8_t dv100_qstep[16] = {
+ 1, /* QNO = 0 and 1 both have no quantization */
+ 1,
+ 2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
+};
+
+static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
+
+int ff_dv_init_dynamic_tables(const DVprofile *d)
+{
+ int j,i,c,s,p;
+ uint32_t *factor1, *factor2;
+ const int *iweight1, *iweight2;
+
+ if (!d->work_chunks[dv_work_pool_size(d)-1].buf_offset) {
+ p = i = 0;
+ for (c=0; c<d->n_difchan; c++) {
+ for (s=0; s<d->difseg_size; s++) {
+ p += 6;
+ for (j=0; j<27; j++) {
+ p += !(j%3);
+ if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
+ !(DV_PROFILE_IS_720p50(d) && s > 9)) {
+ dv_calc_mb_coordinates(d, c, s, j, &d->work_chunks[i].mb_coordinates[0]);
+ d->work_chunks[i++].buf_offset = p;
+ }
+ p += 5;
+ }
+ }
}
}
+
+ if (!d->idct_factor[DV_PROFILE_IS_HD(d)?8191:5631]) {
+ factor1 = &d->idct_factor[0];
+ factor2 = &d->idct_factor[DV_PROFILE_IS_HD(d)?4096:2816];
+ if (d->height == 720) {
+ iweight1 = &ff_dv_iweight_720_y[0];
+ iweight2 = &ff_dv_iweight_720_c[0];
+ } else {
+ iweight1 = &ff_dv_iweight_1080_y[0];
+ iweight2 = &ff_dv_iweight_1080_c[0];
+ }
+ if (DV_PROFILE_IS_HD(d)) {
+ for (c = 0; c < 4; c++) {
+ for (s = 0; s < 16; s++) {
+ for (i = 0; i < 64; i++) {
+ *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];
+ *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];
+ }
+ }
+ }
+ } else {
+ iweight1 = &ff_dv_iweight_88[0];
+ for (j = 0; j < 2; j++, iweight1 = &ff_dv_iweight_248[0]) {
+ for (s = 0; s < 22; s++) {
+ for (i = c = 0; c < 4; c++) {
+ for (; i < dv_quant_areas[c]; i++) {
+ *factor1 = iweight1[i] << (ff_dv_quant_shifts[s][c] + 1);
+ *factor2++ = (*factor1++) << 1;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return 0;
}
-static int dvvideo_init(AVCodecContext *avctx)
+av_cold int ff_dvvideo_init(AVCodecContext *avctx)
{
- DVVideoDecodeContext *s = avctx->priv_data;
+ DVVideoContext *s = avctx->priv_data;
DSPContext dsp;
- static int done=0;
- int i;
+ static int done = 0;
+ int i, j;
if (!done) {
- int i;
VLC dv_vlc;
+ uint16_t new_dv_vlc_bits[NB_DV_VLC*2];
+ uint8_t new_dv_vlc_len[NB_DV_VLC*2];
+ uint8_t new_dv_vlc_run[NB_DV_VLC*2];
+ int16_t new_dv_vlc_level[NB_DV_VLC*2];
done = 1;
+ /* it's faster to include sign bit in a generic VLC parsing scheme */
+ for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
+ new_dv_vlc_bits[j] = dv_vlc_bits[i];
+ new_dv_vlc_len[j] = dv_vlc_len[i];
+ new_dv_vlc_run[j] = dv_vlc_run[i];
+ new_dv_vlc_level[j] = dv_vlc_level[i];
+
+ if (dv_vlc_level[i]) {
+ new_dv_vlc_bits[j] <<= 1;
+ new_dv_vlc_len[j]++;
+
+ j++;
+ new_dv_vlc_bits[j] = (dv_vlc_bits[i] << 1) | 1;
+ new_dv_vlc_len[j] = dv_vlc_len[i] + 1;
+ new_dv_vlc_run[j] = dv_vlc_run[i];
+ new_dv_vlc_level[j] = -dv_vlc_level[i];
+ }
+ }
+
/* NOTE: as a trick, we use the fact the no codes are unused
to accelerate the parsing of partial codes */
- init_vlc(&dv_vlc, TEX_VLC_BITS, NB_DV_VLC,
- dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2);
+ init_vlc(&dv_vlc, TEX_VLC_BITS, j,
+ new_dv_vlc_len, 1, 1, new_dv_vlc_bits, 2, 2, 0);
+ assert(dv_vlc.table_size == 1184);
- dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));
- for(i = 0; i < dv_vlc.table_size; i++){
- int code= dv_vlc.table[i][0];
- int len = dv_vlc.table[i][1];
+ for (i = 0; i < dv_vlc.table_size; i++){
+ int code = dv_vlc.table[i][0];
+ int len = dv_vlc.table[i][1];
int level, run;
-
- if(len<0){ //more bits needed
- run= 0;
- level= code;
- } else if (code == (NB_DV_VLC - 1)) {
- /* EOB */
- run = 0;
- level = 256;
+
+ if (len < 0){ //more bits needed
+ run = 0;
+ level = code;
} else {
- run= dv_vlc_run[code] + 1;
- level= dv_vlc_level[code];
+ run = new_dv_vlc_run [code] + 1;
+ level = new_dv_vlc_level[code];
}
- dv_rl_vlc[0][i].len = len;
- dv_rl_vlc[0][i].level = level;
- dv_rl_vlc[0][i].run = run;
+ ff_dv_rl_vlc[i].len = len;
+ ff_dv_rl_vlc[i].level = level;
+ ff_dv_rl_vlc[i].run = run;
}
-
- memset(dv_vlc_codes, 0xff, sizeof(dv_vlc_codes));
- for (i = 0; i < NB_DV_VLC - 1; i++) {
- if (dv_vlc_run[i] < 15 && dv_vlc_level[i] < 23 && dv_vlc_len[i] < 15)
- dv_vlc_codes[dv_vlc_run[i]][dv_vlc_level[i]] = i;
- }
+ ff_free_vlc(&dv_vlc);
}
/* Generic DSP setup */
- dsputil_init(&dsp, avctx);
+ ff_dsputil_init(&dsp, avctx);
+ ff_set_cmp(&dsp, dsp.ildct_cmp, avctx->ildct_cmp);
s->get_pixels = dsp.get_pixels;
+ s->ildct_cmp = dsp.ildct_cmp[5];
/* 88DCT setup */
- s->fdct[0] = dsp.fdct;
+ s->fdct[0] = dsp.fdct;
s->idct_put[0] = dsp.idct_put;
- for (i=0; i<64; i++)
+ for (i = 0; i < 64; i++)
s->dv_zigzag[0][i] = dsp.idct_permutation[ff_zigzag_direct[i]];
/* 248DCT setup */
- s->fdct[1] = dsp.fdct248;
- s->idct_put[1] = simple_idct248_put; // FIXME: need to add it to DSP
+ s->fdct[1] = dsp.fdct248;
+ s->idct_put[1] = ff_simple_idct248_put; // FIXME: need to add it to DSP
memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
- /* XXX: do it only for constant case */
- dv_build_unquantize_tables(s, dsp.idct_permutation);
-
- /* FIXME: I really don't think this should be here */
- if (dv_codec_profile(avctx))
- avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt;
avctx->coded_frame = &s->picture;
-
+ s->avctx = avctx;
+ avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
+
return 0;
}
-// #define VLC_DEBUG
-
-typedef struct BlockInfo {
- const uint8_t *shift_table;
- const uint8_t *scan_table;
- uint8_t pos; /* position in block */
- uint8_t eob_reached; /* true if EOB has been reached */
- uint8_t dct_mode;
- uint8_t partial_bit_count;
- uint16_t partial_bit_buffer;
- int shift_offset;
-} BlockInfo;
-
-/* block size in bits */
-static const uint16_t block_sizes[6] = {
- 112, 112, 112, 112, 80, 80
-};
-
-#ifndef ALT_BITSTREAM_READER
-#warning only works with ALT_BITSTREAM_READER
-#endif
-
-/* decode ac coefs */
-static void dv_decode_ac(DVVideoDecodeContext *s,
- BlockInfo *mb, DCTELEM *block, int last_index)
+static av_cold int dvvideo_init_encoder(AVCodecContext *avctx)
{
- int last_re_index;
- int shift_offset = mb->shift_offset;
- const uint8_t *scan_table = mb->scan_table;
- const uint8_t *shift_table = mb->shift_table;
- int pos = mb->pos;
- int level, pos1, sign, run;
- int partial_bit_count;
-#ifndef ALT_BITSTREAM_READER //FIXME
- int re_index=0;
- int re1_index=0;
-#endif
- OPEN_READER(re, &s->gb);
-
-#ifdef VLC_DEBUG
- printf("start\n");
-#endif
-
- /* if we must parse a partial vlc, we do it here */
- partial_bit_count = mb->partial_bit_count;
- if (partial_bit_count > 0) {
- uint8_t buf[4];
- uint32_t v;
- int l, l1;
- GetBitContext gb1;
-
- /* build the dummy bit buffer */
- l = 16 - partial_bit_count;
- UPDATE_CACHE(re, &s->gb);
-#ifdef VLC_DEBUG
- printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));
-#endif
- v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);
- buf[0] = v >> 8;
- buf[1] = v;
-#ifdef VLC_DEBUG
- printf("v=%04x cnt=%d %04x\n",
- v, partial_bit_count, (mb->partial_bit_buffer << l));
-#endif
- /* try to read the codeword */
- init_get_bits(&gb1, buf, 4*8);
- {
- OPEN_READER(re1, &gb1);
- UPDATE_CACHE(re1, &gb1);
- GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0],
- TEX_VLC_BITS, 2);
- l = re1_index;
- CLOSE_READER(re1, &gb1);
- }
-#ifdef VLC_DEBUG
- printf("****run=%d level=%d size=%d\n", run, level, l);
-#endif
- /* compute codeword length */
- l1 = (level != 256 && level != 0);
- /* if too long, we cannot parse */
- l -= partial_bit_count;
- if ((re_index + l + l1) > last_index)
- return;
- /* skip read bits */
- last_re_index = 0; /* avoid warning */
- re_index += l;
- /* by definition, if we can read the vlc, all partial bits
- will be read (otherwise we could have read the vlc before) */
- mb->partial_bit_count = 0;
- UPDATE_CACHE(re, &s->gb);
- goto handle_vlc;
+ if (!avpriv_dv_codec_profile(avctx)) {
+ av_log(avctx, AV_LOG_ERROR, "Found no DV profile for %ix%i %s video. "
+ "Valid DV profiles are:\n",
+ avctx->width, avctx->height, av_get_pix_fmt_name(avctx->pix_fmt));
+ ff_dv_print_profiles(avctx, AV_LOG_ERROR);
+ return AVERROR(EINVAL);
}
- /* get the AC coefficients until last_index is reached */
- for(;;) {
- UPDATE_CACHE(re, &s->gb);
-#ifdef VLC_DEBUG
- printf("%2d: bits=%04x index=%d\n",
- pos, SHOW_UBITS(re, &s->gb, 16), re_index);
-#endif
- last_re_index = re_index;
- GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0],
- TEX_VLC_BITS, 2);
- handle_vlc:
-#ifdef VLC_DEBUG
- printf("run=%d level=%d\n", run, level);
-#endif
- if (level == 256) {
- if (re_index > last_index) {
- cannot_read:
- /* put position before read code */
- re_index = last_re_index;
- mb->eob_reached = 0;
- break;
- }
- /* EOB */
- mb->eob_reached = 1;
- break;
- } else if (level != 0) {
- if ((re_index + 1) > last_index)
- goto cannot_read;
- sign = SHOW_SBITS(re, &s->gb, 1);
- level = (level ^ sign) - sign;
- LAST_SKIP_BITS(re, &s->gb, 1);
- pos += run;
- /* error */
- if (pos >= 64) {
- goto read_error;
- }
- pos1 = scan_table[pos];
- level = level << (shift_table[pos1] + shift_offset);
- block[pos1] = level;
- // printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);
- } else {
- if (re_index > last_index)
- goto cannot_read;
- /* level is zero: means run without coding. No
- sign is coded */
- pos += run;
- /* error */
- if (pos >= 64) {
- read_error:
-#if defined(VLC_DEBUG) || 1
- fprintf(stderr, "error pos=%d\n", pos);
-#endif
- /* for errors, we consider the eob is reached */
- mb->eob_reached = 1;
- break;
- }
- }
- }
- CLOSE_READER(re, &s->gb);
- mb->pos = pos;
+ dv_vlc_map_tableinit();
+
+ return ff_dvvideo_init(avctx);
}
-static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)
+/* bit budget for AC only in 5 MBs */
+static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5;
+static const int mb_area_start[5] = { 1, 6, 21, 43, 64 };
+
+static inline int put_bits_left(PutBitContext* s)
{
- while (bits_left >= 16) {
- put_bits(pb, 16, get_bits(gb, 16));
- bits_left -= 16;
- }
- if (bits_left > 0) {
- put_bits(pb, bits_left, get_bits(gb, bits_left));
- }
+ return (s->buf_end - s->buf) * 8 - put_bits_count(s);
}
-/* mb_x and mb_y are in units of 8 pixels */
-static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
- uint8_t *buf_ptr1,
- const uint16_t *mb_pos_ptr)
+#if CONFIG_SMALL
+/* Converts run and level (where level != 0) pair into VLC, returning bit size */
+static av_always_inline int dv_rl2vlc(int run, int level, int sign, uint32_t* vlc)
{
- int quant, dc, dct_mode, class1, j;
- int mb_index, mb_x, mb_y, v, last_index;
- DCTELEM *block, *block1;
- int c_offset, bits_left;
- uint8_t *y_ptr;
- BlockInfo mb_data[5 * 6], *mb, *mb1;
- void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
- uint8_t *buf_ptr;
- PutBitContext pb, vs_pb;
- uint8_t mb_bit_buffer[80 + 4]; /* allow some slack */
- int mb_bit_count;
- uint8_t vs_bit_buffer[5 * 80 + 4]; /* allow some slack */
- int vs_bit_count;
-
- memset(s->block, 0, sizeof(s->block));
-
- /* pass 1 : read DC and AC coefficients in blocks */
- buf_ptr = buf_ptr1;
- block1 = &s->block[0][0];
- mb1 = mb_data;
- init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
- vs_bit_count = 0;
- for(mb_index = 0; mb_index < 5; mb_index++) {
- /* skip header */
- quant = buf_ptr[3] & 0x0f;
- buf_ptr += 4;
- init_put_bits(&pb, mb_bit_buffer, 80);
- mb_bit_count = 0;
- mb = mb1;
- block = block1;
- for(j = 0;j < 6; j++) {
- /* NOTE: size is not important here */
- init_get_bits(&s->gb, buf_ptr, 14*8);
-
- /* get the dc */
- dc = get_bits(&s->gb, 9);
- dc = (dc << (32 - 9)) >> (32 - 9);
- dct_mode = get_bits1(&s->gb);
- mb->dct_mode = dct_mode;
- mb->scan_table = s->dv_zigzag[dct_mode];
- class1 = get_bits(&s->gb, 2);
- mb->shift_offset = (class1 == 3);
- mb->shift_table = s->dv_idct_shift[dct_mode]
- [quant + dv_quant_offset[class1]];
- dc = dc << 2;
- /* convert to unsigned because 128 is not added in the
- standard IDCT */
- dc += 1024;
- block[0] = dc;
- last_index = block_sizes[j];
- buf_ptr += last_index >> 3;
- mb->pos = 0;
- mb->partial_bit_count = 0;
-
-#ifdef VLC_DEBUG
- printf("MB block: %d, %d ", mb_index, j);
-#endif
- dv_decode_ac(s, mb, block, last_index);
-
- /* write the remaining bits in a new buffer only if the
- block is finished */
- bits_left = last_index - get_bits_count(&s->gb);
- if (mb->eob_reached) {
- mb->partial_bit_count = 0;
- mb_bit_count += bits_left;
- bit_copy(&pb, &s->gb, bits_left);
- } else {
- /* should be < 16 bits otherwise a codeword could have
- been parsed */
- mb->partial_bit_count = bits_left;
- mb->partial_bit_buffer = get_bits(&s->gb, bits_left);
- }
- block += 64;
- mb++;
- }
-
- flush_put_bits(&pb);
-
- /* pass 2 : we can do it just after */
-#ifdef VLC_DEBUG
- printf("***pass 2 size=%d MB#=%d\n", mb_bit_count, mb_index);
-#endif
- block = block1;
- mb = mb1;
- init_get_bits(&s->gb, mb_bit_buffer, 80*8);
- for(j = 0;j < 6; j++) {
- if (!mb->eob_reached && get_bits_count(&s->gb) < mb_bit_count) {
- dv_decode_ac(s, mb, block, mb_bit_count);
- /* if still not finished, no need to parse other blocks */
- if (!mb->eob_reached) {
- /* we could not parse the current AC coefficient,
- so we add the remaining bytes */
- bits_left = mb_bit_count - get_bits_count(&s->gb);
- if (bits_left > 0) {
- mb->partial_bit_count += bits_left;
- mb->partial_bit_buffer =
- (mb->partial_bit_buffer << bits_left) |
- get_bits(&s->gb, bits_left);
- }
- goto next_mb;
- }
- }
- block += 64;
- mb++;
- }
- /* all blocks are finished, so the extra bytes can be used at
- the video segment level */
- bits_left = mb_bit_count - get_bits_count(&s->gb);
- vs_bit_count += bits_left;
- bit_copy(&vs_pb, &s->gb, bits_left);
- next_mb:
- mb1 += 6;
- block1 += 6 * 64;
+ int size;
+ if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
+ *vlc = dv_vlc_map[run][level].vlc | sign;
+ size = dv_vlc_map[run][level].size;
}
-
- /* we need a pass other the whole video segment */
- flush_put_bits(&vs_pb);
-
-#ifdef VLC_DEBUG
- printf("***pass 3 size=%d\n", vs_bit_count);
-#endif
- block = &s->block[0][0];
- mb = mb_data;
- init_get_bits(&s->gb, vs_bit_buffer, 5 * 80*8);
- for(mb_index = 0; mb_index < 5; mb_index++) {
- for(j = 0;j < 6; j++) {
- if (!mb->eob_reached) {
-#ifdef VLC_DEBUG
- printf("start %d:%d\n", mb_index, j);
-#endif
- dv_decode_ac(s, mb, block, vs_bit_count);
- }
- block += 64;
- mb++;
+ else {
+ if (level < DV_VLC_MAP_LEV_SIZE) {
+ *vlc = dv_vlc_map[0][level].vlc | sign;
+ size = dv_vlc_map[0][level].size;
+ } else {
+ *vlc = 0xfe00 | (level << 1) | sign;
+ size = 16;
}
- }
-
- /* compute idct and place blocks */
- block = &s->block[0][0];
- mb = mb_data;
- for(mb_index = 0; mb_index < 5; mb_index++) {
- v = *mb_pos_ptr++;
- mb_x = v & 0xff;
- mb_y = v >> 8;
- y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);
- if (s->sys->pix_fmt == PIX_FMT_YUV411P)
- c_offset = (mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8);
- else
- c_offset = ((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8);
- for(j = 0;j < 6; j++) {
- idct_put = s->idct_put[mb->dct_mode];
- if (j < 4) {
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
- /* NOTE: at end of line, the macroblock is handled as 420 */
- idct_put(y_ptr + (j * 8), s->picture.linesize[0], block);
- } else {
- idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]),
- s->picture.linesize[0], block);
- }
- } else {
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
- uint64_t aligned_pixels[64/8];
- uint8_t *pixels= (uint8_t*)aligned_pixels;
- uint8_t *c_ptr, *c_ptr1, *ptr;
- int y, linesize;
- /* NOTE: at end of line, the macroblock is handled as 420 */
- idct_put(pixels, 8, block);
- linesize = s->picture.linesize[6 - j];
- c_ptr = s->picture.data[6 - j] + c_offset;
- ptr = pixels;
- for(y = 0;y < 8; y++) {
- /* convert to 411P */
- c_ptr1 = c_ptr + 8*linesize;
- c_ptr[0]= ptr[0]; c_ptr1[0]= ptr[4];
- c_ptr[1]= ptr[1]; c_ptr1[1]= ptr[5];
- c_ptr[2]= ptr[2]; c_ptr1[2]= ptr[6];
- c_ptr[3]= ptr[3]; c_ptr1[3]= ptr[7];
- c_ptr += linesize;
- ptr += 8;
- }
- } else {
- /* don't ask me why they inverted Cb and Cr ! */
- idct_put(s->picture.data[6 - j] + c_offset,
- s->picture.linesize[6 - j], block);
- }
- }
- block += 64;
- mb++;
+ if (run) {
+ *vlc |= ((run < 16) ? dv_vlc_map[run-1][0].vlc :
+ (0x1f80 | (run - 1))) << size;
+ size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;
}
}
+
+ return size;
}
-/* Converts run and level (where level != 0) pair into vlc, returning bit size */
-static inline int dv_rl2vlc(int run, int l, uint32_t* vlc)
+static av_always_inline int dv_rl2vlc_size(int run, int level)
{
- int sign = l >> 8;
- int level = (l ^ sign) - sign;
int size;
-
- sign = (sign & 1);
- if (run < 15 && level < 23 && dv_vlc_codes[run][level] != -1) {
- *vlc = (dv_vlc_bits[dv_vlc_codes[run][level]] << 1) | sign;
- size = dv_vlc_len[dv_vlc_codes[run][level]] + 1;
+ if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
+ size = dv_vlc_map[run][level].size;
}
- else {
- if (level < 23) {
- *vlc = (dv_vlc_bits[dv_vlc_codes[0][level]] << 1) | sign;
- size = dv_vlc_len[dv_vlc_codes[0][level]] + 1;
- } else {
- *vlc = 0xfe00 | (level << 1) | sign;
- size = 16;
- }
-
- switch(run) {
- case 0:
- break;
- case 1:
- case 2:
- *vlc |= ((0x7ce | (run - 1)) << size);
- size += 11;
- break;
- case 3:
- case 4:
- case 5:
- case 6:
- *vlc |= ((0xfac | (run - 3)) << size);
- size += 12;
- break;
- default:
- *vlc |= ((0x1f80 | (run - 1)) << size);
- size += 13;
- break;
- }
+ else {
+ size = (level < DV_VLC_MAP_LEV_SIZE) ? dv_vlc_map[0][level].size : 16;
+ if (run) {
+ size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;
+ }
}
-
return size;
}
+#else
+static av_always_inline int dv_rl2vlc(int run, int l, int sign, uint32_t* vlc)
+{
+ *vlc = dv_vlc_map[run][l].vlc | sign;
+ return dv_vlc_map[run][l].size;
+}
+
+static av_always_inline int dv_rl2vlc_size(int run, int l)
+{
+ return dv_vlc_map[run][l].size;
+}
+#endif
typedef struct EncBlockInfo {
- int qno;
- int cno;
- int dct_mode;
- int block_size;
- DCTELEM *mb;
- PutBitContext pb;
- const uint8_t* zigzag_scan;
- uint8_t *dv_shift;
+ int area_q[4];
+ int bit_size[4];
+ int prev[5];
+ int cur_ac;
+ int cno;
+ int dct_mode;
+ DCTELEM mb[64];
+ uint8_t next[64];
+ uint8_t sign[64];
+ uint8_t partial_bit_count;
+ uint32_t partial_bit_buffer; /* we can't use uint16_t here */
} EncBlockInfo;
-static inline int dv_bits_left(EncBlockInfo* bi)
+static av_always_inline PutBitContext* dv_encode_ac(EncBlockInfo* bi,
+ PutBitContext* pb_pool,
+ PutBitContext* pb_end)
{
- return (bi->block_size - get_bit_count(&bi->pb));
-}
+ int prev, bits_left;
+ PutBitContext* pb = pb_pool;
+ int size = bi->partial_bit_count;
+ uint32_t vlc = bi->partial_bit_buffer;
+
+ bi->partial_bit_count = bi->partial_bit_buffer = 0;
+ for (;;){
+ /* Find suitable storage space */
+ for (; size > (bits_left = put_bits_left(pb)); pb++) {
+ if (bits_left) {
+ size -= bits_left;
+ put_bits(pb, bits_left, vlc >> size);
+ vlc = vlc & ((1 << size) - 1);
+ }
+ if (pb + 1 >= pb_end) {
+ bi->partial_bit_count = size;
+ bi->partial_bit_buffer = vlc;
+ return pb;
+ }
+ }
-static inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* heap)
-{
- int i, level, size, run = 0;
- uint32_t vlc;
- PutBitContext* cpb = &bi->pb;
- int bias = (bi->cno == 3);
-
- for (i=1; i<64; i++) {
- level = bi->mb[bi->zigzag_scan[i]] / (1<<(bi->dv_shift[i] + bias));
- if (level != 0) {
- size = dv_rl2vlc(run, level, &vlc);
-put_vlc:
-
-#ifdef VLC_DEBUG
- printf(" %3d:%3d", run, level);
-#endif
- if (cpb == &bi->pb && size > dv_bits_left(bi)) {
- size -= dv_bits_left(bi);
- put_bits(cpb, dv_bits_left(bi), vlc >> size);
- vlc = vlc & ((1<<size)-1);
- cpb = heap;
- }
- put_bits(cpb, size, vlc);
- run = 0;
- } else
- run++;
+ /* Store VLC */
+ put_bits(pb, size, vlc);
+
+ if (bi->cur_ac >= 64)
+ break;
+
+ /* Construct the next VLC */
+ prev = bi->cur_ac;
+ bi->cur_ac = bi->next[prev];
+ if (bi->cur_ac < 64){
+ size = dv_rl2vlc(bi->cur_ac - prev - 1, bi->mb[bi->cur_ac], bi->sign[bi->cur_ac], &vlc);
+ } else {
+ size = 4; vlc = 6; /* End Of Block stamp */
+ }
}
-
- if (i == 64) {
- size = 4; vlc = 6; /* End Of Block stamp */
- goto put_vlc;
+ return pb;
+}
+
+static av_always_inline int dv_guess_dct_mode(DVVideoContext *s, uint8_t *data, int linesize) {
+ if (s->avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
+ int ps = s->ildct_cmp(NULL, data, NULL, linesize, 8) - 400;
+ if (ps > 0) {
+ int is = s->ildct_cmp(NULL, data , NULL, linesize<<1, 4) +
+ s->ildct_cmp(NULL, data + linesize, NULL, linesize<<1, 4);
+ return ps > is;
+ }
}
+
+ return 0;
}
-static inline void dv_redistr_bits(EncBlockInfo* bi, int count, uint8_t* extra_data, int extra_bits, PutBitContext* heap)
+static const int dv_weight_bits = 18;
+static const int dv_weight_88[64] = {
+ 131072, 257107, 257107, 242189, 252167, 242189, 235923, 237536,
+ 237536, 235923, 229376, 231390, 223754, 231390, 229376, 222935,
+ 224969, 217965, 217965, 224969, 222935, 200636, 218652, 211916,
+ 212325, 211916, 218652, 200636, 188995, 196781, 205965, 206433,
+ 206433, 205965, 196781, 188995, 185364, 185364, 200636, 200704,
+ 200636, 185364, 185364, 174609, 180568, 195068, 195068, 180568,
+ 174609, 170091, 175557, 189591, 175557, 170091, 165371, 170627,
+ 170627, 165371, 160727, 153560, 160727, 144651, 144651, 136258,
+};
+static const int dv_weight_248[64] = {
+ 131072, 242189, 257107, 237536, 229376, 200636, 242189, 223754,
+ 224969, 196781, 262144, 242189, 229376, 200636, 257107, 237536,
+ 211916, 185364, 235923, 217965, 229376, 211916, 206433, 180568,
+ 242189, 223754, 224969, 196781, 211916, 185364, 235923, 217965,
+ 200704, 175557, 222935, 205965, 200636, 185364, 195068, 170627,
+ 229376, 211916, 206433, 180568, 200704, 175557, 222935, 205965,
+ 175557, 153560, 188995, 174609, 165371, 144651, 200636, 185364,
+ 195068, 170627, 175557, 153560, 188995, 174609, 165371, 144651,
+};
+
+static av_always_inline int dv_init_enc_block(EncBlockInfo* bi, uint8_t *data, int linesize, DVVideoContext *s, int bias)
{
- int i;
- GetBitContext gb;
-
- init_get_bits(&gb, extra_data, extra_bits);
-
- for (i=0; i<count; i++) {
- int bits_left = dv_bits_left(bi);
-#ifdef VLC_DEBUG
- if (bits_left)
- printf("------------> inserting %d bytes in %d:%d\n", bits_left, i/6, i%6);
+ const int *weight;
+ const uint8_t* zigzag_scan;
+ LOCAL_ALIGNED_16(DCTELEM, blk, [64]);
+ int i, area;
+ /* We offer two different methods for class number assignment: the
+ method suggested in SMPTE 314M Table 22, and an improved
+ method. The SMPTE method is very conservative; it assigns class
+ 3 (i.e. severe quantization) to any block where the largest AC
+ component is greater than 36. Libav's DV encoder tracks AC bit
+ consumption precisely, so there is no need to bias most blocks
+ towards strongly lossy compression. Instead, we assign class 2
+ to most blocks, and use class 3 only when strictly necessary
+ (for blocks whose largest AC component exceeds 255). */
+
+#if 0 /* SMPTE spec method */
+ static const int classes[] = {12, 24, 36, 0xffff};
+#else /* improved Libav method */
+ static const int classes[] = {-1, -1, 255, 0xffff};
#endif
- if (bits_left > extra_bits) {
- bit_copy(&bi->pb, &gb, extra_bits);
- extra_bits = 0;
- break;
- } else
- bit_copy(&bi->pb, &gb, bits_left);
-
- extra_bits -= bits_left;
- bi++;
+ int max = classes[0];
+ int prev = 0;
+
+ assert((((int)blk) & 15) == 0);
+
+ bi->area_q[0] = bi->area_q[1] = bi->area_q[2] = bi->area_q[3] = 0;
+ bi->partial_bit_count = 0;
+ bi->partial_bit_buffer = 0;
+ bi->cur_ac = 0;
+ if (data) {
+ bi->dct_mode = dv_guess_dct_mode(s, data, linesize);
+ s->get_pixels(blk, data, linesize);
+ s->fdct[bi->dct_mode](blk);
+ } else {
+ /* We rely on the fact that encoding all zeros leads to an immediate EOB,
+ which is precisely what the spec calls for in the "dummy" blocks. */
+ memset(blk, 0, 64*sizeof(*blk));
+ bi->dct_mode = 0;
}
-
- if (extra_bits > 0 && heap)
- bit_copy(heap, &gb, extra_bits);
-}
+ bi->mb[0] = blk[0];
+
+ zigzag_scan = bi->dct_mode ? ff_zigzag248_direct : ff_zigzag_direct;
+ weight = bi->dct_mode ? dv_weight_248 : dv_weight_88;
+
+ for (area = 0; area < 4; area++) {
+ bi->prev[area] = prev;
+ bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)
+ for (i = mb_area_start[area]; i < mb_area_start[area+1]; i++) {
+ int level = blk[zigzag_scan[i]];
+
+ if (level + 15 > 30U) {
+ bi->sign[i] = (level >> 31) & 1;
+ /* weight it and and shift down into range, adding for rounding */
+ /* the extra division by a factor of 2^4 reverses the 8x expansion of the DCT
+ AND the 2x doubling of the weights */
+ level = (FFABS(level) * weight[i] + (1 << (dv_weight_bits+3))) >> (dv_weight_bits+4);
+ bi->mb[i] = level;
+ if (level > max)
+ max = level;
+ bi->bit_size[area] += dv_rl2vlc_size(i - prev - 1, level);
+ bi->next[prev]= i;
+ prev = i;
+ }
+ }
+ }
+ bi->next[prev]= i;
+ for (bi->cno = 0; max > classes[bi->cno]; bi->cno++);
-static inline void dv_set_class_number(EncBlockInfo* bi, int j)
-{
- int i, max_ac = 0;
+ bi->cno += bias;
- for (i=1; i<64; i++) {
- int ac = abs(bi->mb[ff_zigzag_direct[i]]) / 4;
- if (max_ac < ac)
- max_ac = ac;
- }
- if (max_ac < 12)
- bi->cno = j;
- else if (max_ac < 24)
- bi->cno = j + 1;
- else if (max_ac < 36)
- bi->cno = j + 2;
- else
- bi->cno = j + 3;
-
- if (bi->cno > 3)
+ if (bi->cno >= 3) {
bi->cno = 3;
+ prev = 0;
+ i = bi->next[prev];
+ for (area = 0; area < 4; area++) {
+ bi->prev[area] = prev;
+ bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)
+ for (; i < mb_area_start[area+1]; i = bi->next[i]) {
+ bi->mb[i] >>= 1;
+
+ if (bi->mb[i]) {
+ bi->bit_size[area] += dv_rl2vlc_size(i - prev - 1, bi->mb[i]);
+ bi->next[prev]= i;
+ prev = i;
+ }
+ }
+ }
+ bi->next[prev]= i;
+ }
+
+ return bi->bit_size[0] + bi->bit_size[1] + bi->bit_size[2] + bi->bit_size[3];
}
-#define SQ(a) ((a)*(a))
-static int dv_score_lines(DCTELEM *s, int stride) {
- int score=0;
- int x, y;
-
- for(y=0; y<4; y++) {
- for(x=0; x<8; x+=4){
- score+= SQ(s[x ] - s[x +stride]) + SQ(s[x+1] - s[x+1+stride])
- +SQ(s[x+2] - s[x+2+stride]) + SQ(s[x+3] - s[x+3+stride]);
+static inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos)
+{
+ int size[5];
+ int i, j, k, a, prev, a2;
+ EncBlockInfo* b;
+
+ size[0] = size[1] = size[2] = size[3] = size[4] = 1 << 24;
+ do {
+ b = blks;
+ for (i = 0; i < 5; i++) {
+ if (!qnos[i])
+ continue;
+
+ qnos[i]--;
+ size[i] = 0;
+ for (j = 0; j < 6; j++, b++) {
+ for (a = 0; a < 4; a++) {
+ if (b->area_q[a] != ff_dv_quant_shifts[qnos[i] + ff_dv_quant_offset[b->cno]][a]) {
+ b->bit_size[a] = 1; // 4 areas 4 bits for EOB :)
+ b->area_q[a]++;
+ prev = b->prev[a];
+ assert(b->next[prev] >= mb_area_start[a+1] || b->mb[prev]);
+ for (k = b->next[prev] ; k < mb_area_start[a+1]; k = b->next[k]) {
+ b->mb[k] >>= 1;
+ if (b->mb[k]) {
+ b->bit_size[a] += dv_rl2vlc_size(k - prev - 1, b->mb[k]);
+ prev = k;
+ } else {
+ if (b->next[k] >= mb_area_start[a+1] && b->next[k]<64){
+ for (a2 = a + 1; b->next[k] >= mb_area_start[a2+1]; a2++)
+ b->prev[a2] = prev;
+ assert(a2 < 4);
+ assert(b->mb[b->next[k]]);
+ b->bit_size[a2] += dv_rl2vlc_size(b->next[k] - prev - 1, b->mb[b->next[k]])
+ -dv_rl2vlc_size(b->next[k] - k - 1, b->mb[b->next[k]]);
+ assert(b->prev[a2] == k && (a2 + 1 >= 4 || b->prev[a2+1] != k));
+ b->prev[a2] = prev;
+ }
+ b->next[prev] = b->next[k];
+ }
+ }
+ b->prev[a+1]= prev;
+ }
+ size[i] += b->bit_size[a];
+ }
+ }
+ if (vs_total_ac_bits >= size[0] + size[1] + size[2] + size[3] + size[4])
+ return;
+ }
+ } while (qnos[0]|qnos[1]|qnos[2]|qnos[3]|qnos[4]);
+
+
+ for (a = 2; a == 2 || vs_total_ac_bits < size[0]; a += a){
+ b = blks;
+ size[0] = 5 * 6 * 4; //EOB
+ for (j = 0; j < 6 *5; j++, b++) {
+ prev = b->prev[0];
+ for (k = b->next[prev]; k < 64; k = b->next[k]) {
+ if (b->mb[k] < a && b->mb[k] > -a){
+ b->next[prev] = b->next[k];
+ }else{
+ size[0] += dv_rl2vlc_size(k - prev - 1, b->mb[k]);
+ prev = k;
+ }
+ }
}
- s+= stride;
}
-
- return score;
}
-/*
- * This is a very rough initial implementaion. The performance is
- * horrible and the weighting is missing. But it's missing from the
- * decoding step also -- so at least we're on the same page with decoder ;-)
- */
-static inline void dv_encode_video_segment(DVVideoDecodeContext *s,
- uint8_t *dif,
- const uint16_t *mb_pos_ptr)
+static int dv_encode_video_segment(AVCodecContext *avctx, void *arg)
{
- int mb_index, i, j, v;
- int mb_x, mb_y, c_offset, linesize;
+ DVVideoContext *s = avctx->priv_data;
+ DVwork_chunk *work_chunk = arg;
+ int mb_index, i, j;
+ int mb_x, mb_y, c_offset, linesize, y_stride;
uint8_t* y_ptr;
- uint8_t* data;
- int do_edge_wrap;
- DCTELEM *block;
- EncBlockInfo enc_blks[5*6];
+ uint8_t* dif;
+ LOCAL_ALIGNED_8(uint8_t, scratch, [128]);
+ EncBlockInfo enc_blks[5*DV_MAX_BPM];
+ PutBitContext pbs[5*DV_MAX_BPM];
+ PutBitContext* pb;
EncBlockInfo* enc_blk;
- int free_vs_bits;
- int extra_bits;
- PutBitContext extra_vs;
- uint8_t extra_vs_data[5*6*128];
- uint8_t extra_mb_data[6*128];
-
- int QNO = 15;
-
- /* Stage 1 -- doing DCT on 5 MBs */
- block = &s->block[0][0];
+ int vs_bit_size = 0;
+ int qnos[5] = {15, 15, 15, 15, 15}; /* No quantization */
+ int* qnosp = &qnos[0];
+
+ dif = &s->buf[work_chunk->buf_offset*80];
enc_blk = &enc_blks[0];
- for(mb_index = 0; mb_index < 5; mb_index++) {
- v = *mb_pos_ptr++;
- mb_x = v & 0xff;
- mb_y = v >> 8;
- y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);
- c_offset = (s->sys->pix_fmt == PIX_FMT_YUV411P) ?
- ((mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8)) :
- (((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8));
- do_edge_wrap = 0;
- for(j = 0;j < 6; j++) {
- if (j < 4) { /* Four Y blocks */
- /* NOTE: at end of line, the macroblock is handled as 420 */
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
- data = y_ptr + (j * 8);
- } else {
- data = y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]);
+ for (mb_index = 0; mb_index < 5; mb_index++) {
+ dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
+
+ /* initializing luminance blocks */
+ if ((s->sys->pix_fmt == PIX_FMT_YUV420P) ||
+ (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
+ (s->sys->height >= 720 && mb_y != 134)) {
+ y_stride = s->picture.linesize[0] << 3;
+ } else {
+ y_stride = 16;
+ }
+ y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << 3);
+ linesize = s->picture.linesize[0];
+
+ if (s->sys->video_stype == 4) { /* SD 422 */
+ vs_bit_size +=
+ dv_init_enc_block(enc_blk+0, y_ptr , linesize, s, 0) +
+ dv_init_enc_block(enc_blk+1, NULL , linesize, s, 0) +
+ dv_init_enc_block(enc_blk+2, y_ptr + 8 , linesize, s, 0) +
+ dv_init_enc_block(enc_blk+3, NULL , linesize, s, 0);
+ } else {
+ vs_bit_size +=
+ dv_init_enc_block(enc_blk+0, y_ptr , linesize, s, 0) +
+ dv_init_enc_block(enc_blk+1, y_ptr + 8 , linesize, s, 0) +
+ dv_init_enc_block(enc_blk+2, y_ptr + y_stride, linesize, s, 0) +
+ dv_init_enc_block(enc_blk+3, y_ptr + 8 + y_stride, linesize, s, 0);
+ }
+ enc_blk += 4;
+
+ /* initializing chrominance blocks */
+ c_offset = (((mb_y >> (s->sys->pix_fmt == PIX_FMT_YUV420P)) * s->picture.linesize[1] +
+ (mb_x >> ((s->sys->pix_fmt == PIX_FMT_YUV411P) ? 2 : 1))) << 3);
+ for (j = 2; j; j--) {
+ uint8_t *c_ptr = s->picture.data[j] + c_offset;
+ linesize = s->picture.linesize[j];
+ y_stride = (mb_y == 134) ? 8 : (s->picture.linesize[j] << 3);
+ if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
+ uint8_t* d;
+ uint8_t* b = scratch;
+ for (i = 0; i < 8; i++) {
+ d = c_ptr + (linesize << 3);
+ b[0] = c_ptr[0]; b[1] = c_ptr[1]; b[2] = c_ptr[2]; b[3] = c_ptr[3];
+ b[4] = d[0]; b[5] = d[1]; b[6] = d[2]; b[7] = d[3];
+ c_ptr += linesize;
+ b += 16;
}
- linesize = s->picture.linesize[0];
- } else { /* Cr and Cb blocks */
- /* don't ask Fabrice why they inverted Cb and Cr ! */
- data = s->picture.data[6 - j] + c_offset;
- linesize = s->picture.linesize[6 - j];
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8))
- do_edge_wrap = 1;
- }
-
- /* Everything is set up -- now just copy data -> DCT block */
- if (do_edge_wrap) { /* Edge wrap copy: 4x16 -> 8x8 */
- uint8_t* d;
- DCTELEM *b = block;
- for (i=0;i<8;i++) {
- d = data + 8 * linesize;
- b[0] = data[0]; b[1] = data[1]; b[2] = data[2]; b[3] = data[3];
- b[4] = d[0]; b[5] = d[1]; b[6] = d[2]; b[7] = d[3];
- data += linesize;
- b += 8;
- }
- } else { /* Simple copy: 8x8 -> 8x8 */
- s->get_pixels(block, data, linesize);
- }
-
- if (dv_score_lines(block, 8) + dv_score_lines(block+8*4, 8) - 100 >
- dv_score_lines(block, 16) + dv_score_lines(block+8, 16)) {
- enc_blk->dct_mode = 1;
- enc_blk->zigzag_scan = ff_zigzag248_direct;
- } else {
- enc_blk->dct_mode = 0;
- enc_blk->zigzag_scan = ff_zigzag_direct;
- }
- enc_blk->mb = block;
- enc_blk->block_size = block_sizes[j];
-
- s->fdct[enc_blk->dct_mode](block);
-
- dv_set_class_number(enc_blk, j/4*(j%2));
-
- block += 64;
- enc_blk++;
+ c_ptr = scratch;
+ linesize = 16;
+ }
+
+ vs_bit_size += dv_init_enc_block( enc_blk++, c_ptr , linesize, s, 1);
+ if (s->sys->bpm == 8) {
+ vs_bit_size += dv_init_enc_block(enc_blk++, c_ptr + y_stride, linesize, s, 1);
+ }
}
}
- /* Stage 2 -- encoding by trial-and-error */
-encode_vs:
- enc_blk = &enc_blks[0];
- for (i=0; i<5; i++) {
- uint8_t* p = dif + i*80 + 4;
- for (j=0; j<6; j++) {
- enc_blk->qno = QNO;
- enc_blk->dv_shift = &(s->dv_dct_shift[0]
- [QNO + dv_quant_offset[enc_blk->cno]][0]);
- init_put_bits(&enc_blk->pb, p, block_sizes[j]/8);
- enc_blk++;
- p += block_sizes[j]/8;
- }
- }
+ if (vs_total_ac_bits < vs_bit_size)
+ dv_guess_qnos(&enc_blks[0], qnosp);
- init_put_bits(&extra_vs, extra_vs_data, sizeof(extra_vs_data));
- free_vs_bits = 0;
- enc_blk = &enc_blks[0];
- for (i=0; i<5; i++) {
- PutBitContext extra_mb;
- EncBlockInfo* enc_blk2 = enc_blk;
- int free_mb_bits = 0;
-
- init_put_bits(&extra_mb, extra_mb_data, sizeof(extra_mb_data));
- dif[i*80 + 3] = enc_blk->qno;
-
- for (j=0; j<6; j++) {
- uint16_t dc = ((enc_blk->mb[0] >> 3) - 1024) >> 2;
-
- put_bits(&enc_blk->pb, 9, dc);
- put_bits(&enc_blk->pb, 1, enc_blk->dct_mode);
- put_bits(&enc_blk->pb, 2, enc_blk->cno);
-
-#ifdef VLC_DEBUG
- printf("[%d, %d]: ", i, j);
-#endif
- dv_encode_ac(enc_blk, &extra_mb);
-#ifdef VLC_DEBUG
- printf("\n");
-#endif
-
- free_mb_bits += dv_bits_left(enc_blk);
- enc_blk++;
- }
-
- /* We can't flush extra_mb just yet -- since it'll round up bit number */
- extra_bits = get_bit_count(&extra_mb);
- if (free_mb_bits > extra_bits)
- free_vs_bits += free_mb_bits - extra_bits;
-
- if (extra_bits) { /* FIXME: speed up things when free_mb_bits == 0 */
- flush_put_bits(&extra_mb);
- dv_redistr_bits(enc_blk2, 6, extra_mb_data, extra_bits, &extra_vs);
- }
+ /* DIF encoding process */
+ for (j=0; j<5*s->sys->bpm;) {
+ int start_mb = j;
+
+ dif[3] = *qnosp++;
+ dif += 4;
+
+ /* First pass over individual cells only */
+ for (i=0; i<s->sys->bpm; i++, j++) {
+ int sz = s->sys->block_sizes[i]>>3;
+
+ init_put_bits(&pbs[j], dif, sz);
+ put_sbits(&pbs[j], 9, ((enc_blks[j].mb[0] >> 3) - 1024 + 2) >> 2);
+ put_bits(&pbs[j], 1, enc_blks[j].dct_mode);
+ put_bits(&pbs[j], 2, enc_blks[j].cno);
+
+ dv_encode_ac(&enc_blks[j], &pbs[j], &pbs[j+1]);
+ dif += sz;
+ }
+
+ /* Second pass over each MB space */
+ pb = &pbs[start_mb];
+ for (i=0; i<s->sys->bpm; i++) {
+ if (enc_blks[start_mb+i].partial_bit_count)
+ pb = dv_encode_ac(&enc_blks[start_mb+i], pb, &pbs[start_mb+s->sys->bpm]);
+ }
}
-
- /* We can't flush extra_mb just yet -- since it'll round up bit number */
- extra_bits = get_bit_count(&extra_vs);
- if (extra_bits > free_vs_bits && QNO) { /* FIXME: very crude trial-and-error */
- QNO--;
- goto encode_vs;
+
+ /* Third and final pass over the whole video segment space */
+ pb = &pbs[0];
+ for (j=0; j<5*s->sys->bpm; j++) {
+ if (enc_blks[j].partial_bit_count)
+ pb = dv_encode_ac(&enc_blks[j], pb, &pbs[s->sys->bpm*5]);
+ if (enc_blks[j].partial_bit_count)
+ av_log(avctx, AV_LOG_ERROR, "ac bitstream overflow\n");
}
-
- if (extra_bits) {
- flush_put_bits(&extra_vs);
- dv_redistr_bits(&enc_blks[0], 5*6, extra_vs_data, extra_bits, NULL);
+
+ for (j=0; j<5*s->sys->bpm; j++) {
+ int pos;
+ int size = pbs[j].size_in_bits >> 3;
+ flush_put_bits(&pbs[j]);
+ pos = put_bits_count(&pbs[j]) >> 3;
+ if (pos > size) {
+ av_log(avctx, AV_LOG_ERROR, "bitstream written beyond buffer size\n");
+ return -1;
+ }
+ memset(pbs[j].buf + pos, 0xff, size - pos);
}
- for (i=0; i<6*5; i++) {
- flush_put_bits(&enc_blks[i].pb);
-#ifdef VLC_DEBUG
- printf("[%d:%d] qno=%d cno=%d\n", i/6, i%6, enc_blks[i].qno, enc_blks[i].cno);
-#endif
+ return 0;
+}
+
+static inline int dv_write_pack(enum dv_pack_type pack_id, DVVideoContext *c,
+ uint8_t* buf)
+{
+ /*
+ * Here's what SMPTE314M says about these two:
+ * (page 6) APTn, AP1n, AP2n, AP3n: These data shall be identical
+ * as track application IDs (APTn = 001, AP1n =
+ * 001, AP2n = 001, AP3n = 001), if the source signal
+ * comes from a digital VCR. If the signal source is
+ * unknown, all bits for these data shall be set to 1.
+ * (page 12) STYPE: STYPE defines a signal type of video signal
+ * 00000b = 4:1:1 compression
+ * 00100b = 4:2:2 compression
+ * XXXXXX = Reserved
+ * Now, I've got two problems with these statements:
+ * 1. it looks like APT == 111b should be a safe bet, but it isn't.
+ * It seems that for PAL as defined in IEC 61834 we have to set
+ * APT to 000 and for SMPTE314M to 001.
+ * 2. It is not at all clear what STYPE is used for 4:2:0 PAL
+ * compression scheme (if any).
+ */
+ int apt = (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0 : 1);
+
+ uint8_t aspect = 0;
+ if ((int)(av_q2d(c->avctx->sample_aspect_ratio) * c->avctx->width / c->avctx->height * 10) >= 17) /* 16:9 */
+ aspect = 0x02;
+
+ buf[0] = (uint8_t)pack_id;
+ switch (pack_id) {
+ case dv_header525: /* I can't imagine why these two weren't defined as real */
+ case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
+ buf[1] = 0xf8 | /* reserved -- always 1 */
+ (apt & 0x07); /* APT: Track application ID */
+ buf[2] = (0 << 7) | /* TF1: audio data is 0 - valid; 1 - invalid */
+ (0x0f << 3) | /* reserved -- always 1 */
+ (apt & 0x07); /* AP1: Audio application ID */
+ buf[3] = (0 << 7) | /* TF2: video data is 0 - valid; 1 - invalid */
+ (0x0f << 3) | /* reserved -- always 1 */
+ (apt & 0x07); /* AP2: Video application ID */
+ buf[4] = (0 << 7) | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */
+ (0x0f << 3) | /* reserved -- always 1 */
+ (apt & 0x07); /* AP3: Subcode application ID */
+ break;
+ case dv_video_source:
+ buf[1] = 0xff; /* reserved -- always 1 */
+ buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
+ (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
+ (3 << 4) | /* CLF: color frames ID (see ITU-R BT.470-4) */
+ 0xf; /* reserved -- always 1 */
+ buf[3] = (3 << 6) | /* reserved -- always 1 */
+ (c->sys->dsf << 5) | /* system: 60fields/50fields */
+ c->sys->video_stype; /* signal type video compression */
+ buf[4] = 0xff; /* VISC: 0xff -- no information */
+ break;
+ case dv_video_control:
+ buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
+ 0x3f; /* reserved -- always 1 */
+ buf[2] = 0xc8 | /* reserved -- always b11001xxx */
+ aspect;
+ buf[3] = (1 << 7) | /* frame/field flag 1 -- frame, 0 -- field */
+ (1 << 6) | /* first/second field flag 0 -- field 2, 1 -- field 1 */
+ (1 << 5) | /* frame change flag 0 -- same picture as before, 1 -- different */
+ (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
+ 0xc; /* reserved -- always b1100 */
+ buf[4] = 0xff; /* reserved -- always 1 */
+ break;
+ default:
+ buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
}
+ return 5;
}
-/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
- 144000 bytes for PAL) */
-static int dvvideo_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
+#if CONFIG_DVVIDEO_ENCODER
+static inline int dv_write_dif_id(enum dv_section_type t, uint8_t chan_num,
+ uint8_t seq_num, uint8_t dif_num,
+ uint8_t* buf)
{
- DVVideoDecodeContext *s = avctx->priv_data;
- int ds, vs;
- const uint16_t *mb_pos_ptr;
-
- s->sys = dv_frame_profile(buf);
- if (!s->sys || buf_size < s->sys->frame_size)
- return -1; /* NOTE: we only accept several full frames */
-
-
- if(s->picture.data[0])
- avctx->release_buffer(avctx, &s->picture);
-
- s->picture.reference = 0;
- avctx->pix_fmt = s->sys->pix_fmt;
- avctx->width = s->sys->width;
- avctx->height = s->sys->height;
- if(avctx->get_buffer(avctx, &s->picture) < 0) {
- fprintf(stderr, "get_buffer() failed\n");
- return -1;
+ buf[0] = (uint8_t)t; /* Section type */
+ buf[1] = (seq_num << 4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
+ (chan_num << 3) | /* FSC: for 50Mb/s 0 - first channel; 1 - second */
+ 7; /* reserved -- always 1 */
+ buf[2] = dif_num; /* DIF block number Video: 0-134, Audio: 0-8 */
+ return 3;
+}
+
+
+static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
+{
+ if (syb_num == 0 || syb_num == 6) {
+ buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
+ (0 << 4) | /* AP3 (Subcode application ID) */
+ 0x0f; /* reserved -- always 1 */
}
- s->picture.interlaced_frame = 1;
- s->picture.top_field_first = 0;
-
- /* for each DIF segment */
- mb_pos_ptr = s->sys->video_place;
- for (ds = 0; ds < s->sys->difseg_size; ds++) {
- buf += 6 * 80; /* skip DIF segment header */
-
- for(vs = 0; vs < 27; vs++) {
- if ((vs % 3) == 0)
- buf += 80; /* skip audio block */
-
-#ifdef VLC_DEBUG
- printf("********************* %d, %d **********************\n", ds, vs);
-#endif
- dv_decode_video_segment(s, buf, mb_pos_ptr);
- buf += 5 * 80;
- mb_pos_ptr += 5;
- }
+ else if (syb_num == 11) {
+ buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
+ 0x7f; /* reserved -- always 1 */
+ }
+ else {
+ buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
+ (0 << 4) | /* APT (Track application ID) */
+ 0x0f; /* reserved -- always 1 */
}
+ buf[1] = 0xf0 | /* reserved -- always 1 */
+ (syb_num & 0x0f); /* SSYB number 0 - 11 */
+ buf[2] = 0xff; /* reserved -- always 1 */
+ return 3;
+}
- emms_c();
+static void dv_format_frame(DVVideoContext* c, uint8_t* buf)
+{
+ int chan, i, j, k;
+
+ for (chan = 0; chan < c->sys->n_difchan; chan++) {
+ for (i = 0; i < c->sys->difseg_size; i++) {
+ memset(buf, 0xff, 80 * 6); /* first 6 DIF blocks are for control data */
+
+ /* DV header: 1DIF */
+ buf += dv_write_dif_id(dv_sect_header, chan, i, 0, buf);
+ buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
+ buf += 72; /* unused bytes */
+
+ /* DV subcode: 2DIFs */
+ for (j = 0; j < 2; j++) {
+ buf += dv_write_dif_id(dv_sect_subcode, chan, i, j, buf);
+ for (k = 0; k < 6; k++)
+ buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf) + 5;
+ buf += 29; /* unused bytes */
+ }
- /* return image */
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data= s->picture;
-
- return s->sys->frame_size;
+ /* DV VAUX: 3DIFS */
+ for (j = 0; j < 3; j++) {
+ buf += dv_write_dif_id(dv_sect_vaux, chan, i, j, buf);
+ buf += dv_write_pack(dv_video_source, c, buf);
+ buf += dv_write_pack(dv_video_control, c, buf);
+ buf += 7*5;
+ buf += dv_write_pack(dv_video_source, c, buf);
+ buf += dv_write_pack(dv_video_control, c, buf);
+ buf += 4*5 + 2; /* unused bytes */
+ }
+
+ /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
+ for (j = 0; j < 135; j++) {
+ if (j%15 == 0) {
+ memset(buf, 0xff, 80);
+ buf += dv_write_dif_id(dv_sect_audio, chan, i, j/15, buf);
+ buf += 77; /* audio control & shuffled PCM audio */
+ }
+ buf += dv_write_dif_id(dv_sect_video, chan, i, j, buf);
+ buf += 77; /* 1 video macroblock: 1 bytes control
+ 4 * 14 bytes Y 8x8 data
+ 10 bytes Cr 8x8 data
+ 10 bytes Cb 8x8 data */
+ }
+ }
+ }
}
-static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size,
- void *data)
+
+static int dvvideo_encode_frame(AVCodecContext *c, AVPacket *pkt,
+ const AVFrame *frame, int *got_packet)
{
- DVVideoDecodeContext *s = c->priv_data;
- const uint16_t *mb_pos_ptr;
- int ds, vs;
-
- s->sys = dv_codec_profile(c);
- if (!s->sys)
- return -1;
-
- c->pix_fmt = s->sys->pix_fmt;
- s->picture = *((AVFrame *)data);
-
- /* for each DIF segment */
- mb_pos_ptr = s->sys->video_place;
- for (ds = 0; ds < s->sys->difseg_size; ds++) {
- buf += 6 * 80; /* skip DIF segment header */
-
- for(vs = 0; vs < 27; vs++) {
- if ((vs % 3) == 0)
- buf += 80; /* skip audio block */
-
-#ifdef VLC_DEBUG
- printf("********************* %d, %d **********************\n", ds, vs);
-#endif
- dv_encode_video_segment(s, buf, mb_pos_ptr);
- buf += 5 * 80;
- mb_pos_ptr += 5;
- }
+ DVVideoContext *s = c->priv_data;
+ int ret;
+
+ s->sys = avpriv_dv_codec_profile(c);
+ if (!s->sys || ff_dv_init_dynamic_tables(s->sys))
+ return -1;
+ if ((ret = ff_alloc_packet(pkt, s->sys->frame_size)) < 0) {
+ av_log(c, AV_LOG_ERROR, "Error getting output packet.\n");
+ return ret;
}
+ c->pix_fmt = s->sys->pix_fmt;
+ s->picture = *frame;
+ s->picture.key_frame = 1;
+ s->picture.pict_type = AV_PICTURE_TYPE_I;
+
+ s->buf = pkt->data;
+ c->execute(c, dv_encode_video_segment, s->sys->work_chunks, NULL,
+ dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
+
emms_c();
- return s->sys->frame_size;
-}
-static int dvvideo_end(AVCodecContext *avctx)
-{
- avcodec_default_free_buffers(avctx);
+ dv_format_frame(s, pkt->data);
+
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ *got_packet = 1;
+
return 0;
}
-AVCodec dvvideo_decoder = {
- "dvvideo",
- CODEC_TYPE_VIDEO,
- CODEC_ID_DVVIDEO,
- sizeof(DVVideoDecodeContext),
- dvvideo_init,
- dvvideo_encode_frame,
- dvvideo_end,
- dvvideo_decode_frame,
- CODEC_CAP_DR1,
- NULL
+AVCodec ff_dvvideo_encoder = {
+ .name = "dvvideo",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_DVVIDEO,
+ .priv_data_size = sizeof(DVVideoContext),
+ .init = dvvideo_init_encoder,
+ .encode2 = dvvideo_encode_frame,
+ .capabilities = CODEC_CAP_SLICE_THREADS,
+ .pix_fmts = (const enum PixelFormat[]) {
+ PIX_FMT_YUV411P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, PIX_FMT_NONE
+ },
+ .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
};
+#endif // CONFIG_DVVIDEO_ENCODER
projects / ffmpeg / blobdiff