-/* decode ac coefficients */
-static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)
-{
- int last_index = gb->size_in_bits;
- const uint8_t *scan_table = mb->scan_table;
- const uint32_t *factor_table = mb->factor_table;
- int pos = mb->pos;
- int partial_bit_count = mb->partial_bit_count;
- int level, run, vlc_len, index;
-
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
-
- /* if we must parse a partial vlc, we do it here */
- if (partial_bit_count > 0) {
- re_cache = ((unsigned)re_cache >> partial_bit_count) |
- (mb->partial_bit_buffer << (sizeof(re_cache) * 8 - partial_bit_count));
- re_index -= partial_bit_count;
- mb->partial_bit_count = 0;
- }
-
- /* get the AC coefficients until last_index is reached */
- for (;;) {
-#ifdef VLC_DEBUG
- printf("%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16), re_index);
-#endif
- /* our own optimized GET_RL_VLC */
- index = NEG_USR32(re_cache, TEX_VLC_BITS);
- vlc_len = dv_rl_vlc[index].len;
- if (vlc_len < 0) {
- index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) + dv_rl_vlc[index].level;
- vlc_len = TEX_VLC_BITS - vlc_len;
- }
- level = dv_rl_vlc[index].level;
- run = dv_rl_vlc[index].run;
-
- /* gotta check if we're still within gb boundaries */
- if (re_index + vlc_len > last_index) {
- /* should be < 16 bits otherwise a codeword could have been parsed */
- mb->partial_bit_count = last_index - re_index;
- mb->partial_bit_buffer = NEG_USR32(re_cache, mb->partial_bit_count);
- re_index = last_index;
- break;
- }
- re_index += vlc_len;
-
-#ifdef VLC_DEBUG
- printf("run=%d level=%d\n", run, level);
-#endif
- pos += run;
- if (pos >= 64)
- break;
-
- level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >> dv_iweight_bits;
- block[scan_table[pos]] = level;
-
- UPDATE_CACHE(re, gb);
- }
- CLOSE_READER(re, gb);
- mb->pos = pos;
-}
-
-static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
-{
- int bits_left = get_bits_left(gb);
- while (bits_left >= MIN_CACHE_BITS) {
- put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));
- bits_left -= MIN_CACHE_BITS;
- }
- if (bits_left > 0) {
- put_bits(pb, bits_left, get_bits(gb, bits_left));
- }
-}
-
-static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
-{
- *mb_x = work_chunk->mb_coordinates[m] & 0xff;
- *mb_y = work_chunk->mb_coordinates[m] >> 8;
-
- /* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
- if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
- *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
- }
-}
-
-/* mb_x and mb_y are in units of 8 pixels */
-static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
-{
- DVVideoContext *s = avctx->priv_data;
- DVwork_chunk *work_chunk = arg;
- int quant, dc, dct_mode, class1, j;
- int mb_index, mb_x, mb_y, last_index;
- int y_stride, linesize;
- DCTELEM *block, *block1;
- int c_offset;
- uint8_t *y_ptr;
- const uint8_t *buf_ptr;
- PutBitContext pb, vs_pb;
- GetBitContext gb;
- BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
- DECLARE_ALIGNED_16(DCTELEM, sblock[5*DV_MAX_BPM][64]);
- DECLARE_ALIGNED_8(uint8_t, mb_bit_buffer[80 + 4]); /* allow some slack */
- DECLARE_ALIGNED_8(uint8_t, vs_bit_buffer[5 * 80 + 4]); /* allow some slack */
- const int log2_blocksize = 3-s->avctx->lowres;
- int is_field_mode[5];
-
- assert((((int)mb_bit_buffer) & 7) == 0);
- assert((((int)vs_bit_buffer) & 7) == 0);
-
- memset(sblock, 0, sizeof(sblock));
-
- /* pass 1 : read DC and AC coefficients in blocks */
- buf_ptr = &s->buf[work_chunk->buf_offset*80];
- block1 = &sblock[0][0];
- mb1 = mb_data;
- init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
- for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
- /* skip header */
- quant = buf_ptr[3] & 0x0f;
- buf_ptr += 4;
- init_put_bits(&pb, mb_bit_buffer, 80);
- mb = mb1;
- block = block1;
- is_field_mode[mb_index] = 0;
- for (j = 0; j < s->sys->bpm; j++) {
- last_index = s->sys->block_sizes[j];
- init_get_bits(&gb, buf_ptr, last_index);
-
- /* get the dc */
- dc = get_sbits(&gb, 9);
- dct_mode = get_bits1(&gb);
- class1 = get_bits(&gb, 2);
- if (DV_PROFILE_IS_HD(s->sys)) {
- mb->idct_put = s->idct_put[0];
- mb->scan_table = s->dv_zigzag[0];
- mb->factor_table = &s->sys->idct_factor[(j >= 4)*4*16*64 + class1*16*64 + quant*64];
- is_field_mode[mb_index] |= !j && dct_mode;
- } else {
- mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
- mb->scan_table = s->dv_zigzag[dct_mode];
- mb->factor_table = &s->sys->idct_factor[(class1 == 3)*2*22*64 + dct_mode*22*64 +
- (quant + dv_quant_offset[class1])*64];
- }
- dc = dc << 2;
- /* convert to unsigned because 128 is not added in the
- standard IDCT */
- dc += 1024;
- block[0] = dc;
- 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(&gb, mb, block);
-
- /* write the remaining bits in a new buffer only if the
- block is finished */
- if (mb->pos >= 64)
- bit_copy(&pb, &gb);
-
- block += 64;
- mb++;
- }
-
- /* pass 2 : we can do it just after */
-#ifdef VLC_DEBUG
- printf("***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
-#endif
- block = block1;
- mb = mb1;
- init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
- flush_put_bits(&pb);
- for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
- if (mb->pos < 64 && get_bits_left(&gb) > 0) {
- dv_decode_ac(&gb, mb, block);
- /* if still not finished, no need to parse other blocks */
- if (mb->pos < 64)
- break;
- }
- }
- /* all blocks are finished, so the extra bytes can be used at
- the video segment level */
- if (j >= s->sys->bpm)
- bit_copy(&vs_pb, &gb);
- }
-
- /* we need a pass other the whole video segment */
-#ifdef VLC_DEBUG
- printf("***pass 3 size=%d\n", put_bits_count(&vs_pb));
-#endif
- block = &sblock[0][0];
- mb = mb_data;
- init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
- flush_put_bits(&vs_pb);
- for (mb_index = 0; mb_index < 5; mb_index++) {
- for (j = 0; j < s->sys->bpm; j++) {
- if (mb->pos < 64) {
-#ifdef VLC_DEBUG
- printf("start %d:%d\n", mb_index, j);
-#endif
- dv_decode_ac(&gb, mb, block);
- }
- if (mb->pos >= 64 && mb->pos < 127)
- av_log(NULL, AV_LOG_ERROR, "AC EOB marker is absent pos=%d\n", mb->pos);
- block += 64;
- mb++;
- }
- }
-
- /* compute idct and place blocks */
- block = &sblock[0][0];
- mb = mb_data;
- for (mb_index = 0; mb_index < 5; mb_index++) {
- dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
-
- /* idct_put'ting luminance */
- 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] << ((!is_field_mode[mb_index]) * log2_blocksize));
- } else {
- y_stride = (2 << log2_blocksize);
- }
- y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << log2_blocksize);
- linesize = s->picture.linesize[0] << is_field_mode[mb_index];
- mb[0] .idct_put(y_ptr , linesize, block + 0*64);
- if (s->sys->video_stype == 4) { /* SD 422 */
- mb[2].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 2*64);
- } else {
- mb[1].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 1*64);
- mb[2].idct_put(y_ptr + y_stride, linesize, block + 2*64);
- mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3*64);
- }
- mb += 4;
- block += 4*64;
-
- /* idct_put'ting chrominance */
- 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))) << log2_blocksize);
- for (j = 2; j; j--) {
- uint8_t *c_ptr = s->picture.data[j] + c_offset;
- 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_ptr1, *ptr1;
- int x, y;
- mb->idct_put(pixels, 8, block);
- for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->picture.linesize[j], pixels += 8) {
- ptr1 = pixels + (1 << (log2_blocksize - 1));
- c_ptr1 = c_ptr + (s->picture.linesize[j] << log2_blocksize);
- for (x = 0; x < (1 << (log2_blocksize - 1)); x++) {
- c_ptr[x] = pixels[x];
- c_ptr1[x] = ptr1[x];
- }
- }
- block += 64; mb++;
- } else {
- y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
- s->picture.linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
- linesize = s->picture.linesize[j] << is_field_mode[mb_index];
- (mb++)-> idct_put(c_ptr , linesize, block); block += 64;
- if (s->sys->bpm == 8) {
- (mb++)->idct_put(c_ptr + y_stride, linesize, block); block += 64;
- }
- }
- }
- }
- return 0;
-}
-