| /* |
| * DV decoder |
| * Copyright (c) 2002 Fabrice Bellard |
| * Copyright (c) 2004 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 file is part of FFmpeg. |
| * |
| * FFmpeg 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 2.1 of the License, or (at your option) any later version. |
| * |
| * 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser 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 |
| * DV decoder |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/internal.h" |
| #include "libavutil/pixdesc.h" |
| |
| #include "avcodec.h" |
| #include "dv.h" |
| #include "dv_profile_internal.h" |
| #include "dvdata.h" |
| #include "get_bits.h" |
| #include "idctdsp.h" |
| #include "internal.h" |
| #include "put_bits.h" |
| #include "simple_idct.h" |
| |
| typedef struct BlockInfo { |
| const uint32_t *factor_table; |
| const uint8_t *scan_table; |
| uint8_t pos; /* position in block */ |
| void (*idct_put)(uint8_t *dest, int line_size, int16_t *block); |
| uint8_t partial_bit_count; |
| uint32_t partial_bit_buffer; |
| int shift_offset; |
| } BlockInfo; |
| |
| static const int dv_iweight_bits = 14; |
| |
| static const uint16_t dv_iweight_88[64] = { |
| 32768, 16705, 16705, 17734, 17032, 17734, 18205, 18081, |
| 18081, 18205, 18725, 18562, 19195, 18562, 18725, 19266, |
| 19091, 19705, 19705, 19091, 19266, 21407, 19643, 20267, |
| 20228, 20267, 19643, 21407, 22725, 21826, 20853, 20806, |
| 20806, 20853, 21826, 22725, 23170, 23170, 21407, 21400, |
| 21407, 23170, 23170, 24598, 23786, 22018, 22018, 23786, |
| 24598, 25251, 24465, 22654, 24465, 25251, 25972, 25172, |
| 25172, 25972, 26722, 27969, 26722, 29692, 29692, 31521, |
| }; |
| static const uint16_t dv_iweight_248[64] = { |
| 32768, 16384, 16705, 16705, 17734, 17734, 17734, 17734, |
| 18081, 18081, 18725, 18725, 21407, 21407, 19091, 19091, |
| 19195, 19195, 18205, 18205, 18725, 18725, 19705, 19705, |
| 20267, 20267, 21826, 21826, 23170, 23170, 20806, 20806, |
| 20267, 20267, 19266, 19266, 21407, 21407, 20853, 20853, |
| 21400, 21400, 23786, 23786, 24465, 24465, 22018, 22018, |
| 23170, 23170, 22725, 22725, 24598, 24598, 24465, 24465, |
| 25172, 25172, 27969, 27969, 25972, 25972, 29692, 29692 |
| }; |
| |
| /** |
| * The "inverse" DV100 weights are actually just the spec weights (zig-zagged). |
| */ |
| static const uint16_t dv_iweight_1080_y[64] = { |
| 128, 16, 16, 17, 17, 17, 18, 18, |
| 18, 18, 18, 18, 19, 18, 18, 19, |
| 19, 19, 19, 19, 19, 42, 38, 40, |
| 40, 40, 38, 42, 44, 43, 41, 41, |
| 41, 41, 43, 44, 45, 45, 42, 42, |
| 42, 45, 45, 48, 46, 43, 43, 46, |
| 48, 49, 48, 44, 48, 49, 101, 98, |
| 98, 101, 104, 109, 104, 116, 116, 123, |
| }; |
| static const uint16_t dv_iweight_1080_c[64] = { |
| 128, 16, 16, 17, 17, 17, 25, 25, |
| 25, 25, 26, 25, 26, 25, 26, 26, |
| 26, 27, 27, 26, 26, 42, 38, 40, |
| 40, 40, 38, 42, 44, 43, 41, 41, |
| 41, 41, 43, 44, 91, 91, 84, 84, |
| 84, 91, 91, 96, 93, 86, 86, 93, |
| 96, 197, 191, 177, 191, 197, 203, 197, |
| 197, 203, 209, 219, 209, 232, 232, 246, |
| }; |
| static const uint16_t dv_iweight_720_y[64] = { |
| 128, 16, 16, 17, 17, 17, 18, 18, |
| 18, 18, 18, 18, 19, 18, 18, 19, |
| 19, 19, 19, 19, 19, 42, 38, 40, |
| 40, 40, 38, 42, 44, 43, 41, 41, |
| 41, 41, 43, 44, 68, 68, 63, 63, |
| 63, 68, 68, 96, 92, 86, 86, 92, |
| 96, 98, 96, 88, 96, 98, 202, 196, |
| 196, 202, 208, 218, 208, 232, 232, 246, |
| }; |
| static const uint16_t dv_iweight_720_c[64] = { |
| 128, 24, 24, 26, 26, 26, 36, 36, |
| 36, 36, 36, 36, 38, 36, 36, 38, |
| 38, 38, 38, 38, 38, 84, 76, 80, |
| 80, 80, 76, 84, 88, 86, 82, 82, |
| 82, 82, 86, 88, 182, 182, 168, 168, |
| 168, 182, 182, 192, 186, 192, 172, 186, |
| 192, 394, 382, 354, 382, 394, 406, 394, |
| 394, 406, 418, 438, 418, 464, 464, 492, |
| }; |
| |
| static void dv_init_weight_tables(DVVideoContext *ctx, const AVDVProfile *d) |
| { |
| int j, i, c, s; |
| uint32_t *factor1 = &ctx->idct_factor[0], |
| *factor2 = &ctx->idct_factor[DV_PROFILE_IS_HD(d) ? 4096 : 2816]; |
| |
| if (DV_PROFILE_IS_HD(d)) { |
| /* 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 |
| }; |
| const uint16_t *iweight1, *iweight2; |
| |
| if (d->height == 720) { |
| iweight1 = &dv_iweight_720_y[0]; |
| iweight2 = &dv_iweight_720_c[0]; |
| } else { |
| iweight1 = &dv_iweight_1080_y[0]; |
| iweight2 = &dv_iweight_1080_c[0]; |
| } |
| 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 { |
| static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 }; |
| const uint16_t *iweight1 = &dv_iweight_88[0]; |
| for (j = 0; j < 2; j++, iweight1 = &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; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| static av_cold int dvvideo_decode_init(AVCodecContext *avctx) |
| { |
| DVVideoContext *s = avctx->priv_data; |
| IDCTDSPContext idsp; |
| int i; |
| |
| memset(&idsp,0, sizeof(idsp)); |
| ff_idctdsp_init(&idsp, avctx); |
| |
| for (i = 0; i < 64; i++) |
| s->dv_zigzag[0][i] = idsp.idct_permutation[ff_zigzag_direct[i]]; |
| |
| if (avctx->lowres){ |
| for (i = 0; i < 64; i++){ |
| int j = ff_dv_zigzag248_direct[i]; |
| s->dv_zigzag[1][i] = idsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2]; |
| } |
| }else |
| memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1])); |
| |
| s->idct_put[0] = idsp.idct_put; |
| s->idct_put[1] = ff_simple_idct248_put; |
| |
| return ff_dvvideo_init(avctx); |
| } |
| |
| /* decode AC coefficients */ |
| static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *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_NOSIZE(re, gb); |
| UPDATE_CACHE(re, gb); |
| |
| /* if we must parse a partial VLC, we do it here */ |
| if (partial_bit_count > 0) { |
| re_cache = re_cache >> partial_bit_count | |
| mb->partial_bit_buffer; |
| re_index -= partial_bit_count; |
| mb->partial_bit_count = 0; |
| } |
| |
| /* get the AC coefficients until last_index is reached */ |
| for (;;) { |
| ff_dlog(NULL, "%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16), |
| re_index); |
| /* our own optimized GET_RL_VLC */ |
| index = NEG_USR32(re_cache, TEX_VLC_BITS); |
| vlc_len = ff_dv_rl_vlc[index].len; |
| if (vlc_len < 0) { |
| index = NEG_USR32((unsigned) re_cache << TEX_VLC_BITS, -vlc_len) + |
| ff_dv_rl_vlc[index].level; |
| vlc_len = TEX_VLC_BITS - vlc_len; |
| } |
| level = ff_dv_rl_vlc[index].level; |
| run = ff_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 = re_cache & ~(-1u >> mb->partial_bit_count); |
| re_index = last_index; |
| break; |
| } |
| re_index += vlc_len; |
| |
| ff_dlog(NULL, "run=%d level=%d\n", run, level); |
| 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)); |
| } |
| |
| /* 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; |
| int16_t *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; |
| LOCAL_ALIGNED_16(int16_t, sblock, [5 * DV_MAX_BPM], [64]); |
| LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [80 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */ |
| LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [80 * 5 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */ |
| const int log2_blocksize = 3-s->avctx->lowres; |
| int is_field_mode[5]; |
| int vs_bit_buffer_damaged = 0; |
| int mb_bit_buffer_damaged[5] = {0}; |
| int retried = 0; |
| int sta; |
| |
| av_assert1((((int) mb_bit_buffer) & 7) == 0); |
| av_assert1((((int) vs_bit_buffer) & 7) == 0); |
| |
| retry: |
| |
| memset(sblock, 0, 5 * DV_MAX_BPM * 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; |
| if (avctx->error_concealment) { |
| if ((buf_ptr[3] >> 4) == 0x0E) |
| vs_bit_buffer_damaged = 1; |
| if (!mb_index) { |
| sta = buf_ptr[3] >> 4; |
| } else if (sta != (buf_ptr[3] >> 4)) |
| vs_bit_buffer_damaged = 1; |
| } |
| 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->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->idct_factor[(class1 == 3) * 2 * 22 * 64 + |
| dct_mode * 22 * 64 + |
| (quant + ff_dv_quant_offset[class1]) * 64]; |
| } |
| dc = dc * 4; |
| /* 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; |
| |
| ff_dlog(avctx, "MB block: %d, %d ", mb_index, j); |
| 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); |
| if (mb->pos >= 64 && mb->pos < 127) |
| vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1; |
| |
| block += 64; |
| mb++; |
| } |
| |
| if (mb_bit_buffer_damaged[mb_index] > 0) |
| continue; |
| |
| /* pass 2: we can do it just after */ |
| ff_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index); |
| block = block1; |
| mb = mb1; |
| init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb)); |
| put_bits32(&pb, 0); // padding must be zeroed |
| 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; |
| if (mb->pos < 127) |
| vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1; |
| } |
| } |
| /* 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 over the whole video segment */ |
| ff_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb)); |
| block = &sblock[0][0]; |
| mb = mb_data; |
| init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb)); |
| put_bits32(&vs_pb, 0); // padding must be zeroed |
| 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 && get_bits_left(&gb) > 0 && !vs_bit_buffer_damaged) { |
| ff_dlog(avctx, "start %d:%d\n", mb_index, j); |
| dv_decode_ac(&gb, mb, block); |
| } |
| |
| if (mb->pos >= 64 && mb->pos < 127) { |
| av_log(avctx, AV_LOG_ERROR, |
| "AC EOB marker is absent pos=%d\n", mb->pos); |
| vs_bit_buffer_damaged = 1; |
| } |
| block += 64; |
| mb++; |
| } |
| } |
| if (vs_bit_buffer_damaged && !retried) { |
| av_log(avctx, AV_LOG_ERROR, "Concealing bitstream errors\n"); |
| retried = 1; |
| goto retry; |
| } |
| |
| /* 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 == AV_PIX_FMT_YUV420P) || |
| (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) || |
| (s->sys->height >= 720 && mb_y != 134)) { |
| y_stride = (s->frame->linesize[0] << |
| ((!is_field_mode[mb_index]) * log2_blocksize)); |
| } else { |
| y_stride = (2 << log2_blocksize); |
| } |
| y_ptr = s->frame->data[0] + |
| ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize); |
| linesize = s->frame->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 == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] + |
| (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize); |
| for (j = 2; j; j--) { |
| uint8_t *c_ptr = s->frame->data[j] + c_offset; |
| if (s->sys->pix_fmt == AV_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->frame->linesize[j], pixels += 8) { |
| ptr1 = pixels + ((1 << (log2_blocksize))>>1); |
| c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize); |
| for (x = 0; x < (1 << FFMAX(log2_blocksize - 1, 0)); x++) { |
| c_ptr[x] = pixels[x]; |
| c_ptr1[x] = ptr1[x]; |
| } |
| } |
| block += 64; |
| mb++; |
| } else { |
| y_stride = (mb_y == 134) ? (1 << log2_blocksize) : |
| s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize); |
| linesize = s->frame->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; |
| } |
| |
| /* NOTE: exactly one frame must be given (120000 bytes for NTSC, |
| * 144000 bytes for PAL - or twice those for 50Mbps) */ |
| static int dvvideo_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_frame, AVPacket *avpkt) |
| { |
| uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| DVVideoContext *s = avctx->priv_data; |
| AVFrame *frame = data; |
| const uint8_t *vsc_pack; |
| int apt, is16_9, ret; |
| const AVDVProfile *sys; |
| |
| sys = ff_dv_frame_profile(avctx, s->sys, buf, buf_size); |
| if (!sys || buf_size < sys->frame_size) { |
| av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n"); |
| return -1; /* NOTE: we only accept several full frames */ |
| } |
| |
| if (sys != s->sys) { |
| ret = ff_dv_init_dynamic_tables(s, sys); |
| if (ret < 0) { |
| av_log(avctx, AV_LOG_ERROR, "Error initializing the work tables.\n"); |
| return ret; |
| } |
| dv_init_weight_tables(s, sys); |
| s->sys = sys; |
| } |
| |
| s->frame = frame; |
| frame->key_frame = 1; |
| frame->pict_type = AV_PICTURE_TYPE_I; |
| avctx->pix_fmt = s->sys->pix_fmt; |
| avctx->framerate = av_inv_q(s->sys->time_base); |
| |
| ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height); |
| if (ret < 0) |
| return ret; |
| |
| /* Determine the codec's sample_aspect ratio from the packet */ |
| vsc_pack = buf + 80 * 5 + 48 + 5; |
| if (*vsc_pack == dv_video_control) { |
| apt = buf[4] & 0x07; |
| is16_9 = (vsc_pack[2] & 0x07) == 0x02 || |
| (!apt && (vsc_pack[2] & 0x07) == 0x07); |
| ff_set_sar(avctx, s->sys->sar[is16_9]); |
| } |
| |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| frame->interlaced_frame = 1; |
| frame->top_field_first = 0; |
| |
| /* Determine the codec's field order from the packet */ |
| if ( *vsc_pack == dv_video_control ) { |
| frame->top_field_first = !(vsc_pack[3] & 0x40); |
| } |
| |
| s->buf = buf; |
| avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL, |
| dv_work_pool_size(s->sys), sizeof(DVwork_chunk)); |
| |
| emms_c(); |
| |
| /* return image */ |
| *got_frame = 1; |
| |
| return s->sys->frame_size; |
| } |
| |
| AVCodec ff_dvvideo_decoder = { |
| .name = "dvvideo", |
| .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_DVVIDEO, |
| .priv_data_size = sizeof(DVVideoContext), |
| .init = dvvideo_decode_init, |
| .decode = dvvideo_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS, |
| .max_lowres = 3, |
| }; |
