* DV decoder
* Copyright (c) 2002 Fabrice Bellard.
*
+ * DV encoder
+ * Copyright (c) 2003 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
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
/**
* @file dv.c
- * DV decoder.
+ * DV codec.
*/
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "simple_idct.h"
-
-#define NTSC_FRAME_SIZE 120000
-#define PAL_FRAME_SIZE 144000
-
-#define TEX_VLC_BITS 9
+#include "dvdata.h"
typedef struct DVVideoDecodeContext {
- AVCodecContext *avctx;
+ const DVprofile* sys;
GetBitContext gb;
- VLC *vlc;
- int sampling_411; /* 0 = 420, 1 = 411 */
- int width, height;
- uint8_t *current_picture[3]; /* picture structure */
AVFrame picture;
- int linesize[3];
DCTELEM block[5*6][64] __align8;
+
+ /* FIXME: the following is extracted from DSP */
uint8_t dv_zigzag[2][64];
uint8_t idct_permutation[64];
+ void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
+ void (*fdct)(DCTELEM *block);
+
/* XXX: move it to static storage ? */
uint8_t dv_shift[2][22][64];
void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
} DVVideoDecodeContext;
-#include "dvdata.h"
-
-static VLC dv_vlc;
+#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];
static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
{
}
}
-static int dvvideo_decode_init(AVCodecContext *avctx)
+static int dvvideo_init(AVCodecContext *avctx)
{
DVVideoDecodeContext *s = avctx->priv_data;
MpegEncContext s2;
if (!done) {
int i;
+ VLC dv_vlc;
done = 1;
dv_rl_vlc[0][i].level = level;
dv_rl_vlc[0][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;
+ }
}
/* ugly way to get the idct & scantable */
if (DCT_common_init(&s2) < 0)
return -1;
+ s->get_pixels = s2.dsp.get_pixels;
+ s->fdct = s2.dsp.fdct;
+
s->idct_put[0] = s2.dsp.idct_put;
memcpy(s->idct_permutation, s2.dsp.idct_permutation, 64);
memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64);
/* XXX: do it only for constant case */
dv_build_unquantize_tables(s);
+
+ /* FIXME: I really don't think this should be here */
+ if (dv_codec_profile(avctx))
+ avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt;
return 0;
}
-//#define VLC_DEBUG
+// #define VLC_DEBUG
typedef struct BlockInfo {
const uint8_t *shift_table;
};
#ifndef ALT_BITSTREAM_READER
-#error only works with ALT_BITSTREAM_READER
+#warning only works with ALT_BITSTREAM_READER
#endif
/* decode ac coefs */
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
if (pos >= 64) {
read_error:
#if defined(VLC_DEBUG) || 1
- printf("error pos=%d\n", pos);
+ fprintf(stderr, "error pos=%d\n", pos);
#endif
/* for errors, we consider the eob is reached */
mb->eob_reached = 1;
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 - s->gb.index;
+ bits_left = last_index - get_bits_count(&s->gb);
if (mb->eob_reached) {
mb->partial_bit_count = 0;
mb_bit_count += bits_left;
/* pass 2 : we can do it just after */
#ifdef VLC_DEBUG
- printf("***pass 2 size=%d\n", mb_bit_count);
+ 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 && s->gb.index < mb_bit_count) {
+ 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 - s->gb.index;
+ bits_left = mb_bit_count - get_bits_count(&s->gb);
if (bits_left > 0) {
mb->partial_bit_count += bits_left;
mb->partial_bit_buffer =
}
/* all blocks are finished, so the extra bytes can be used at
the video segment level */
- bits_left = mb_bit_count - s->gb.index;
+ 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:
v = *mb_pos_ptr++;
mb_x = v & 0xff;
mb_y = v >> 8;
- y_ptr = s->current_picture[0] + (mb_y * s->linesize[0] * 8) + (mb_x * 8);
- if (s->sampling_411)
- c_offset = (mb_y * s->linesize[1] * 8) + ((mb_x >> 2) * 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->linesize[1] * 8) + ((mb_x >> 1) * 8);
+ 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->sampling_411 && mb_x < (704 / 8)) {
+ 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->linesize[0], block);
+ idct_put(y_ptr + (j * 8), s->picture.linesize[0], block);
} else {
- idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->linesize[0]),
- s->linesize[0], block);
+ idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]),
+ s->picture.linesize[0], block);
}
} else {
- if (s->sampling_411 && mb_x >= (704 / 8)) {
+ if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
uint8_t pixels[64], *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->linesize[6 - j];
- c_ptr = s->current_picture[6 - j] + c_offset;
+ 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 + linesize;
- c_ptr1[0] = c_ptr[0] = (ptr[0] + ptr[1]) >> 1;
- c_ptr1[1] = c_ptr[1] = (ptr[2] + ptr[3]) >> 1;
- c_ptr1[2] = c_ptr[2] = (ptr[4] + ptr[5]) >> 1;
- c_ptr1[3] = c_ptr[3] = (ptr[6] + ptr[7]) >> 1;
- c_ptr += linesize * 2;
+ 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->current_picture[6 - j] + c_offset,
- s->linesize[6 - j], block);
+ idct_put(s->picture.data[6 - j] + c_offset,
+ s->picture.linesize[6 - j], block);
}
}
block += 64;
}
}
-
-/* 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)
+/* 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)
{
- DVVideoDecodeContext *s = avctx->priv_data;
- int sct, dsf, apt, ds, nb_dif_segs, vs, width, height, i, packet_size;
- uint8_t *buf_ptr;
- const uint16_t *mb_pos_ptr;
+ int sign = l >> 8;
+ int level = (l ^ sign) - sign;
+ int size;
- /* parse id */
- init_get_bits(&s->gb, buf, buf_size*8);
- sct = get_bits(&s->gb, 3);
- if (sct != 0)
- return -1;
- skip_bits(&s->gb, 5);
- get_bits(&s->gb, 4); /* dsn (sequence number */
- get_bits(&s->gb, 1); /* fsc (channel number) */
- skip_bits(&s->gb, 3);
- get_bits(&s->gb, 8); /* dbn (diff block number 0-134) */
-
- dsf = get_bits(&s->gb, 1); /* 0 = NTSC 1 = PAL */
- if (get_bits(&s->gb, 1) != 0)
- return -1;
- skip_bits(&s->gb, 11);
- apt = get_bits(&s->gb, 3); /* apt */
-
- get_bits(&s->gb, 1); /* tf1 */
- skip_bits(&s->gb, 4);
- get_bits(&s->gb, 3); /* ap1 */
+ sign = (sign & 1);
- get_bits(&s->gb, 1); /* tf2 */
- skip_bits(&s->gb, 4);
- get_bits(&s->gb, 3); /* ap2 */
-
- get_bits(&s->gb, 1); /* tf3 */
- skip_bits(&s->gb, 4);
- get_bits(&s->gb, 3); /* ap3 */
-
- /* init size */
- width = 720;
- if (dsf) {
- avctx->frame_rate = 25;
- packet_size = PAL_FRAME_SIZE;
- height = 576;
- nb_dif_segs = 12;
- } else {
- avctx->frame_rate = 30;
- packet_size = NTSC_FRAME_SIZE;
- height = 480;
- nb_dif_segs = 10;
+ 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;
}
- avctx->frame_rate_base= 1;
- /* NOTE: we only accept several full frames */
- if (buf_size < packet_size)
- return -1;
-
- /* NTSC[dsf == 0] is always 720x480, 4:1:1
- * PAL[dsf == 1] is always 720x576, 4:2:0 for IEC 68134[apt == 0]
- * but for the SMPTE 314M[apt == 1] it is 720x576, 4:1:1
- */
- s->sampling_411 = !dsf || apt;
- if (s->sampling_411) {
- mb_pos_ptr = dsf ? dv_place_411P : dv_place_411;
- avctx->pix_fmt = PIX_FMT_YUV411P;
- } else {
- mb_pos_ptr = dv_place_420;
- avctx->pix_fmt = PIX_FMT_YUV420P;
+ 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;
+ }
}
+
+ return size;
+}
+
+typedef struct EncBlockInfo {
+ int qno;
+ int cno;
+ int dct_mode;
+ int block_size;
+ DCTELEM *mb;
+ PutBitContext pb;
+} EncBlockInfo;
- avctx->width = width;
- avctx->height = height;
+static inline int dv_bits_left(EncBlockInfo* bi)
+{
+ return (bi->block_size - get_bit_count(&bi->pb));
+}
+
+static inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* heap)
+{
+ int i, level, size, run = 0;
+ uint32_t vlc;
+ PutBitContext* cpb = &bi->pb;
- /* Once again, this is pretty complicated by the fact that the same
- * field is used differently by IEC 68134[apt == 0] and
- * SMPTE 314M[apt == 1].
- */
- if (buf[VAUX_TC61_OFFSET] == 0x61 &&
- ((apt == 0 && (buf[VAUX_TC61_OFFSET + 2] & 0x07) == 0x07) ||
- (apt == 1 && (buf[VAUX_TC61_OFFSET + 2] & 0x07) == 0x02)))
- avctx->aspect_ratio = 16.0 / 9.0;
- else
- avctx->aspect_ratio = 4.0 / 3.0;
+ for (i=1; i<64; i++) {
+ level = bi->mb[ff_zigzag_direct[i]] /
+ (1<<(dv_quant_shifts[bi->qno + dv_quant_offset[bi->cno]]
+ [dv_88_areas[ff_zigzag_direct[i]]] + 4 + (bi->cno == 3)));
+ if (level != 0) {
+ size = dv_rl2vlc(run, level, &vlc);
+put_vlc:
- s->picture.reference= 0;
- if(avctx->get_buffer(avctx, &s->picture) < 0) {
- fprintf(stderr, "get_buffer() failed\n");
- return -1;
+#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++;
}
-
- for(i=0;i<3;i++) {
- s->current_picture[i] = s->picture.data[i];
- s->linesize[i] = s->picture.linesize[i];
- if (!s->current_picture[i])
- return -1;
+
+ if (i == 64) {
+ size = 4; vlc = 6; /* End Of Block stamp */
+ goto put_vlc;
}
- s->width = width;
- s->height = height;
+}
- /* for each DIF segment */
- buf_ptr = buf;
- for (ds = 0; ds < nb_dif_segs; ds++) {
- buf_ptr += 6 * 80; /* skip DIF segment header */
-
- for(vs = 0; vs < 27; vs++) {
- if ((vs % 3) == 0) {
- /* skip audio block */
- buf_ptr += 80;
- }
- dv_decode_video_segment(s, buf_ptr, mb_pos_ptr);
- buf_ptr += 5 * 80;
- mb_pos_ptr += 5;
- }
+static inline void dv_redistr_bits(EncBlockInfo* bi, int count, uint8_t* extra_data, int extra_bits, PutBitContext* heap)
+{
+ 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);
+#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++;
}
+
+ if (extra_bits > 0 && heap)
+ bit_copy(heap, &gb, extra_bits);
+}
- emms_c();
+static inline void dv_set_class_number(EncBlockInfo* bi, int j)
+{
+ int i, max_ac = 0;
- /* return image */
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data= s->picture;
-
- avctx->release_buffer(avctx, &s->picture);
+ 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;
- return packet_size;
+ if (bi->cno > 3)
+ bi->cno = 3;
}
-static int dvvideo_decode_end(AVCodecContext *avctx)
+/*
+ * This is a very rough initial implementaion. The performance is
+ * horrible and some features are missing, mainly 2-4-8 DCT encoding.
+ * The weighting is missing as well, 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)
{
- DVVideoDecodeContext *s = avctx->priv_data;
-
- avcodec_default_free_buffers(avctx);
+ int mb_index, i, j, v;
+ int mb_x, mb_y, c_offset, linesize;
+ uint8_t* y_ptr;
+ uint8_t* data;
+ int do_edge_wrap;
+ DCTELEM *block;
+ EncBlockInfo enc_blks[5*6];
+ 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];
+ 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]);
+ }
+ 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);
+ }
+
+ s->fdct(block);
+
+ block += 64;
+ }
+ }
- return 0;
-}
+ /* Stage 2 -- setup for encoding phase */
+ enc_blk = &enc_blks[0];
+ block = &s->block[0][0];
+ for (i=0; i<5; i++) {
+ for (j=0; j<6; j++) {
+ enc_blk->mb = block;
+ enc_blk->dct_mode = 0;
+ enc_blk->block_size = block_sizes[j];
+
+ dv_set_class_number(enc_blk, j/4*(j%2));
+
+ block += 64;
+ enc_blk++;
+ }
+ }
+
+ /* Stage 3 -- 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;
+ init_put_bits(&enc_blk->pb, p, block_sizes[j]/8, NULL, NULL);
+ enc_blk++;
+ p += block_sizes[j]/8;
+ }
+ }
-AVCodec dvvideo_decoder = {
- "dvvideo",
- CODEC_TYPE_VIDEO,
- CODEC_ID_DVVIDEO,
- sizeof(DVVideoDecodeContext),
- dvvideo_decode_init,
- NULL,
- dvvideo_decode_end,
- dvvideo_decode_frame,
- CODEC_CAP_DR1,
- NULL
-};
+ init_put_bits(&extra_vs, extra_vs_data, sizeof(extra_vs_data), NULL, NULL);
+ 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;
-typedef struct DVAudioDecodeContext {
- AVCodecContext *avctx;
- GetBitContext gb;
-} DVAudioDecodeContext;
+ init_put_bits(&extra_mb, extra_mb_data, sizeof(extra_mb_data), NULL, NULL);
+ dif[i*80 + 3] = enc_blk->qno;
+
+ for (j=0; j<6; j++) {
+ uint16_t dc = ((enc_blk->mb[0] >> 3) - 1024) >> 2;
-static int dvaudio_decode_init(AVCodecContext *avctx)
-{
- // DVAudioDecodeContext *s = avctx->priv_data;
- return 0;
-}
+ 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);
-static uint16_t dv_audio_12to16(uint16_t sample)
-{
- uint16_t shift, result;
+#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;
- sample = (sample < 0x800) ? sample : sample | 0xf000;
- shift = (sample & 0xf00) >> 8;
-
- if (shift < 0x2 || shift > 0xd) {
- result = sample;
- } else if (shift < 0x8) {
- shift--;
- result = (sample - (256 * shift)) << shift;
- } else {
- shift = 0xe - shift;
- result = ((sample + ((256 * shift) + 1)) << shift) - 1;
+ 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);
+ }
+ }
+
+ /* 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;
+ }
+
+ if (extra_bits) {
+ flush_put_bits(&extra_vs);
+ dv_redistr_bits(&enc_blks[0], 5*6, extra_vs_data, extra_bits, NULL);
}
- return result;
+ 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
+ }
}
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
- 144000 bytes for PAL)
-
- There's a couple of assumptions being made here:
- 1. By default we silence erroneous (0x8000/16bit 0x800/12bit)
- audio samples. We can pass them upwards when ffmpeg will be ready
- to deal with them.
- 2. We don't do software emphasis.
- 3. Audio is always returned as 16bit linear samples: 12bit
- nonlinear samples are converted into 16bit linear ones.
-*/
-static int dvaudio_decode_frame(AVCodecContext *avctx,
+ 144000 bytes for PAL) */
+static int dvvideo_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
DVVideoDecodeContext *s = avctx->priv_data;
- const uint16_t (*unshuffle)[9];
- int smpls, freq, quant, sys, stride, difseg, ad, dp, nb_dif_segs, i;
- uint16_t lc, rc;
- uint8_t *buf_ptr;
+ int ds, vs;
+ const uint16_t *mb_pos_ptr;
- /* parse id */
- init_get_bits(&s->gb, &buf[AAUX_AS_OFFSET], 5*8);
- i = get_bits(&s->gb, 8);
- if (i != 0x50) { /* No audio ? */
- *data_size = 0;
- return buf_size;
- }
+ 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);
- get_bits(&s->gb, 1); /* 0 - locked audio, 1 - unlocked audio */
- skip_bits(&s->gb, 1);
- smpls = get_bits(&s->gb, 6); /* samples in this frame - min. samples */
+ s->picture.reference = 0;
+ avctx->pix_fmt = s->sys->pix_fmt;
+ if(avctx->get_buffer(avctx, &s->picture) < 0) {
+ fprintf(stderr, "get_buffer() failed\n");
+ return -1;
+ }
- skip_bits(&s->gb, 8);
+ /* 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;
+ }
+ }
- skip_bits(&s->gb, 2);
- sys = get_bits(&s->gb, 1); /* 0 - 60 fields, 1 = 50 fields */
- skip_bits(&s->gb, 5);
+ emms_c();
- get_bits(&s->gb, 1); /* 0 - emphasis on, 1 - emphasis off */
- get_bits(&s->gb, 1); /* 0 - reserved, 1 - emphasis time constant 50/15us */
- freq = get_bits(&s->gb, 3); /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
- quant = get_bits(&s->gb, 3); /* 0 - 16bit linear, 1 - 12bit nonlinear */
+ /* return image */
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data= s->picture;
+
+ return s->sys->frame_size;
+}
- if (quant > 1)
- return -1; /* Unsupported quantization */
+static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size,
+ void *data)
+{
+ DVVideoDecodeContext *s = c->priv_data;
+ const uint16_t *mb_pos_ptr;
+ int ds, vs;
- avctx->sample_rate = dv_audio_frequency[freq];
- avctx->channels = 2;
- // What about:
- // avctx->bit_rate =
- // avctx->frame_size =
-
- *data_size = (dv_audio_min_samples[sys][freq] + smpls) *
- avctx->channels * 2;
-
- if (sys) {
- nb_dif_segs = 12;
- stride = 108;
- unshuffle = dv_place_audio50;
- } else {
- nb_dif_segs = 10;
- stride = 90;
- unshuffle = dv_place_audio60;
- }
+ 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 */
- buf_ptr = buf;
- for (difseg = 0; difseg < nb_dif_segs; difseg++) {
- buf_ptr += 6 * 80; /* skip DIF segment header */
- for (ad = 0; ad < 9; ad++) {
-
- for (dp = 8; dp < 80; dp+=2) {
- if (quant == 0) { /* 16bit quantization */
- i = unshuffle[difseg][ad] + (dp - 8)/2 * stride;
- ((short *)data)[i] = (buf_ptr[dp] << 8) | buf_ptr[dp+1];
- if (((unsigned short *)data)[i] == 0x8000)
- ((short *)data)[i] = 0;
- } else { /* 12bit quantization */
- if (difseg >= nb_dif_segs/2)
- goto out; /* We're not doing 4ch at this time */
-
- lc = ((uint16_t)buf_ptr[dp] << 4) |
- ((uint16_t)buf_ptr[dp+2] >> 4);
- rc = ((uint16_t)buf_ptr[dp+1] << 4) |
- ((uint16_t)buf_ptr[dp+2] & 0x0f);
- lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
- rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
-
- i = unshuffle[difseg][ad] + (dp - 8)/3 * stride;
- ((short *)data)[i] = lc;
- i = unshuffle[difseg+nb_dif_segs/2][ad] + (dp - 8)/3 * stride;
- ((short *)data)[i] = rc;
- ++dp;
- }
- }
-
- buf_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
+ 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;
}
}
-out:
- return buf_size;
+ emms_c();
+ return s->sys->frame_size;
}
-static int dvaudio_decode_end(AVCodecContext *avctx)
+static int dvvideo_end(AVCodecContext *avctx)
{
- // DVAudioDecodeContext *s = avctx->priv_data;
+ avcodec_default_free_buffers(avctx);
return 0;
}
-AVCodec dvaudio_decoder = {
- "dvaudio",
- CODEC_TYPE_AUDIO,
- CODEC_ID_DVAUDIO,
- sizeof(DVAudioDecodeContext),
- dvaudio_decode_init,
- NULL,
- dvaudio_decode_end,
- dvaudio_decode_frame,
- 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
};
projects / ffmpeg / blobdiff