| /* |
| * NewTek SpeedHQ codec |
| * Copyright 2017 Steinar H. Gunderson |
| * |
| * 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 |
| * NewTek SpeedHQ decoder. |
| */ |
| |
| #define BITSTREAM_READER_LE |
| |
| #include "libavutil/attributes.h" |
| |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "internal.h" |
| #include "libavutil/thread.h" |
| #include "mathops.h" |
| #include "mpeg12.h" |
| #include "mpeg12data.h" |
| #include "mpeg12vlc.h" |
| |
| #define MAX_INDEX (64 - 1) |
| |
| /* |
| * 5 bits makes for very small tables, with no more than two lookups needed |
| * for the longest (10-bit) codes. |
| */ |
| #define ALPHA_VLC_BITS 5 |
| |
| typedef struct SHQContext { |
| AVCodecContext *avctx; |
| BlockDSPContext bdsp; |
| IDCTDSPContext idsp; |
| ScanTable intra_scantable; |
| int quant_matrix[64]; |
| enum { SHQ_SUBSAMPLING_420, SHQ_SUBSAMPLING_422, SHQ_SUBSAMPLING_444 } |
| subsampling; |
| enum { SHQ_NO_ALPHA, SHQ_RLE_ALPHA, SHQ_DCT_ALPHA } alpha_type; |
| } SHQContext; |
| |
| |
| /* AC codes: Very similar but not identical to MPEG-2. */ |
| static const uint16_t speedhq_vlc[123][2] = { |
| {0x0001, 2}, {0x0003, 3}, {0x000E, 4}, {0x0007, 5}, |
| {0x0017, 5}, {0x0028, 6}, {0x0008, 6}, {0x006F, 7}, |
| {0x001F, 7}, {0x00C4, 8}, {0x0044, 8}, {0x005F, 8}, |
| {0x00DF, 8}, {0x007F, 8}, {0x00FF, 8}, {0x3E00, 14}, |
| {0x1E00, 14}, {0x2E00, 14}, {0x0E00, 14}, {0x3600, 14}, |
| {0x1600, 14}, {0x2600, 14}, {0x0600, 14}, {0x3A00, 14}, |
| {0x1A00, 14}, {0x2A00, 14}, {0x0A00, 14}, {0x3200, 14}, |
| {0x1200, 14}, {0x2200, 14}, {0x0200, 14}, {0x0C00, 15}, |
| {0x7400, 15}, {0x3400, 15}, {0x5400, 15}, {0x1400, 15}, |
| {0x6400, 15}, {0x2400, 15}, {0x4400, 15}, {0x0400, 15}, |
| {0x0002, 3}, {0x000C, 5}, {0x004F, 7}, {0x00E4, 8}, |
| {0x0004, 8}, {0x0D00, 13}, {0x1500, 13}, {0x7C00, 15}, |
| {0x3C00, 15}, {0x5C00, 15}, {0x1C00, 15}, {0x6C00, 15}, |
| {0x2C00, 15}, {0x4C00, 15}, {0xC800, 16}, {0x4800, 16}, |
| {0x8800, 16}, {0x0800, 16}, {0x0300, 13}, {0x1D00, 13}, |
| {0x0014, 5}, {0x0070, 7}, {0x003F, 8}, {0x00C0, 10}, |
| {0x0500, 13}, {0x0180, 12}, {0x0280, 12}, {0x0C80, 12}, |
| {0x0080, 12}, {0x0B00, 13}, {0x1300, 13}, {0x001C, 5}, |
| {0x0064, 8}, {0x0380, 12}, {0x1900, 13}, {0x0D80, 12}, |
| {0x0018, 6}, {0x00BF, 8}, {0x0480, 12}, {0x0B80, 12}, |
| {0x0038, 6}, {0x0040, 9}, {0x0900, 13}, {0x0030, 7}, |
| {0x0780, 12}, {0x2800, 16}, {0x0010, 7}, {0x0A80, 12}, |
| {0x0050, 7}, {0x0880, 12}, {0x000F, 7}, {0x1100, 13}, |
| {0x002F, 7}, {0x0100, 13}, {0x0084, 8}, {0x5800, 16}, |
| {0x00A4, 8}, {0x9800, 16}, {0x0024, 8}, {0x1800, 16}, |
| {0x0140, 9}, {0xE800, 16}, {0x01C0, 9}, {0x6800, 16}, |
| {0x02C0, 10}, {0xA800, 16}, {0x0F80, 12}, {0x0580, 12}, |
| {0x0980, 12}, {0x0E80, 12}, {0x0680, 12}, {0x1F00, 13}, |
| {0x0F00, 13}, {0x1700, 13}, {0x0700, 13}, {0x1B00, 13}, |
| {0xF800, 16}, {0x7800, 16}, {0xB800, 16}, {0x3800, 16}, |
| {0xD800, 16}, |
| {0x0020, 6}, /* escape */ |
| {0x0006, 4} /* EOB */ |
| }; |
| |
| static const uint8_t speedhq_level[121] = { |
| 1, 2, 3, 4, 5, 6, 7, 8, |
| 9, 10, 11, 12, 13, 14, 15, 16, |
| 17, 18, 19, 20, 21, 22, 23, 24, |
| 25, 26, 27, 28, 29, 30, 31, 32, |
| 33, 34, 35, 36, 37, 38, 39, 40, |
| 1, 2, 3, 4, 5, 6, 7, 8, |
| 9, 10, 11, 12, 13, 14, 15, 16, |
| 17, 18, 19, 20, 1, 2, 3, 4, |
| 5, 6, 7, 8, 9, 10, 11, 1, |
| 2, 3, 4, 5, 1, 2, 3, 4, |
| 1, 2, 3, 1, 2, 3, 1, 2, |
| 1, 2, 1, 2, 1, 2, 1, 2, |
| 1, 2, 1, 2, 1, 2, 1, 2, |
| 1, 2, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, |
| }; |
| |
| static const uint8_t speedhq_run[121] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 2, 2, 2, 2, |
| 2, 2, 2, 2, 2, 2, 2, 3, |
| 3, 3, 3, 3, 4, 4, 4, 4, |
| 5, 5, 5, 6, 6, 6, 7, 7, |
| 8, 8, 9, 9, 10, 10, 11, 11, |
| 12, 12, 13, 13, 14, 14, 15, 15, |
| 16, 16, 17, 18, 19, 20, 21, 22, |
| 23, 24, 25, 26, 27, 28, 29, 30, |
| 31, |
| }; |
| |
| static RLTable ff_rl_speedhq = { |
| 121, |
| 121, |
| (const uint16_t (*)[])speedhq_vlc, |
| speedhq_run, |
| speedhq_level, |
| }; |
| |
| /* NOTE: The first element is always 16, unscaled. */ |
| static const uint8_t unscaled_quant_matrix[64] = { |
| 16, 16, 19, 22, 26, 27, 29, 34, |
| 16, 16, 22, 24, 27, 29, 34, 37, |
| 19, 22, 26, 27, 29, 34, 34, 38, |
| 22, 22, 26, 27, 29, 34, 37, 40, |
| 22, 26, 27, 29, 32, 35, 40, 48, |
| 26, 27, 29, 32, 35, 40, 48, 58, |
| 26, 27, 29, 34, 38, 46, 56, 69, |
| 27, 29, 35, 38, 46, 56, 69, 83 |
| }; |
| |
| static uint8_t ff_speedhq_static_rl_table_store[2][2*MAX_RUN + MAX_LEVEL + 3]; |
| |
| static VLC ff_dc_lum_vlc_le; |
| static VLC ff_dc_chroma_vlc_le; |
| static VLC ff_dc_alpha_run_vlc_le; |
| static VLC ff_dc_alpha_level_vlc_le; |
| |
| static inline int decode_dc_le(GetBitContext *gb, int component) |
| { |
| int code, diff; |
| |
| if (component == 0 || component == 3) { |
| code = get_vlc2(gb, ff_dc_lum_vlc_le.table, DC_VLC_BITS, 2); |
| } else { |
| code = get_vlc2(gb, ff_dc_chroma_vlc_le.table, DC_VLC_BITS, 2); |
| } |
| if (code < 0) { |
| av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n"); |
| return 0xffff; |
| } |
| if (!code) { |
| diff = 0; |
| } else { |
| diff = get_xbits_le(gb, code); |
| } |
| return diff; |
| } |
| |
| static inline int decode_alpha_block(const SHQContext *s, GetBitContext *gb, uint8_t last_alpha[16], uint8_t *dest, int linesize) |
| { |
| uint8_t block[128]; |
| int i = 0, x, y; |
| |
| memset(block, 0, sizeof(block)); |
| |
| { |
| OPEN_READER(re, gb); |
| |
| for ( ;; ) { |
| int run, level; |
| |
| UPDATE_CACHE_LE(re, gb); |
| GET_VLC(run, re, gb, ff_dc_alpha_run_vlc_le.table, ALPHA_VLC_BITS, 2); |
| |
| if (run < 0) break; |
| i += run; |
| if (i >= 128) |
| return AVERROR_INVALIDDATA; |
| |
| UPDATE_CACHE_LE(re, gb); |
| GET_VLC(level, re, gb, ff_dc_alpha_level_vlc_le.table, ALPHA_VLC_BITS, 2); |
| block[i++] = level; |
| } |
| |
| CLOSE_READER(re, gb); |
| } |
| |
| for (y = 0; y < 8; y++) { |
| for (x = 0; x < 16; x++) { |
| last_alpha[x] -= block[y * 16 + x]; |
| } |
| memcpy(dest, last_alpha, 16); |
| dest += linesize; |
| } |
| |
| return 0; |
| } |
| |
| static inline int decode_dct_block(const SHQContext *s, GetBitContext *gb, int last_dc[4], int component, uint8_t *dest, int linesize) |
| { |
| const int *quant_matrix = s->quant_matrix; |
| const uint8_t *scantable = s->intra_scantable.permutated; |
| LOCAL_ALIGNED_32(int16_t, block, [64]); |
| int dc_offset; |
| |
| s->bdsp.clear_block(block); |
| |
| dc_offset = decode_dc_le(gb, component); |
| last_dc[component] -= dc_offset; /* Note: Opposite of most codecs. */ |
| block[scantable[0]] = last_dc[component]; /* quant_matrix[0] is always 16. */ |
| |
| /* Read AC coefficients. */ |
| { |
| int i = 0; |
| OPEN_READER(re, gb); |
| for ( ;; ) { |
| int level, run; |
| UPDATE_CACHE_LE(re, gb); |
| GET_RL_VLC(level, run, re, gb, ff_rl_speedhq.rl_vlc[0], |
| TEX_VLC_BITS, 2, 0); |
| if (level == 127) { |
| break; |
| } else if (level) { |
| i += run; |
| if (i > MAX_INDEX) |
| return AVERROR_INVALIDDATA; |
| /* If next bit is 1, level = -level */ |
| level = (level ^ SHOW_SBITS(re, gb, 1)) - |
| SHOW_SBITS(re, gb, 1); |
| LAST_SKIP_BITS(re, gb, 1); |
| } else { |
| /* Escape. */ |
| #if MIN_CACHE_BITS < 6 + 6 + 12 |
| #error MIN_CACHE_BITS is too small for the escape code, add UPDATE_CACHE |
| #endif |
| run = SHOW_UBITS(re, gb, 6) + 1; |
| SKIP_BITS(re, gb, 6); |
| level = SHOW_UBITS(re, gb, 12) - 2048; |
| LAST_SKIP_BITS(re, gb, 12); |
| |
| i += run; |
| if (i > MAX_INDEX) |
| return AVERROR_INVALIDDATA; |
| } |
| |
| block[scantable[i]] = (level * quant_matrix[i]) >> 4; |
| } |
| CLOSE_READER(re, gb); |
| } |
| |
| s->idsp.idct_put(dest, linesize, block); |
| |
| return 0; |
| } |
| |
| static int decode_speedhq_field(const SHQContext *s, const uint8_t *buf, int buf_size, AVFrame *frame, int field_number, int start, int end, int line_stride) |
| { |
| int ret, slice_number, slice_offsets[5]; |
| int linesize_y = frame->linesize[0] * line_stride; |
| int linesize_cb = frame->linesize[1] * line_stride; |
| int linesize_cr = frame->linesize[2] * line_stride; |
| int linesize_a; |
| |
| if (s->alpha_type != SHQ_NO_ALPHA) |
| linesize_a = frame->linesize[3] * line_stride; |
| |
| if (end < start || end - start < 3 || end > buf_size) |
| return AVERROR_INVALIDDATA; |
| |
| slice_offsets[0] = start; |
| slice_offsets[4] = end; |
| for (slice_number = 1; slice_number < 4; slice_number++) { |
| uint32_t last_offset, slice_len; |
| |
| last_offset = slice_offsets[slice_number - 1]; |
| slice_len = AV_RL24(buf + last_offset); |
| slice_offsets[slice_number] = last_offset + slice_len; |
| |
| if (slice_len < 3 || slice_offsets[slice_number] > end - 3) |
| return AVERROR_INVALIDDATA; |
| } |
| |
| for (slice_number = 0; slice_number < 4; slice_number++) { |
| GetBitContext gb; |
| uint32_t slice_begin, slice_end; |
| int x, y; |
| |
| slice_begin = slice_offsets[slice_number]; |
| slice_end = slice_offsets[slice_number + 1]; |
| |
| if ((ret = init_get_bits8(&gb, buf + slice_begin + 3, slice_end - slice_begin - 3)) < 0) |
| return ret; |
| |
| for (y = slice_number * 16 * line_stride; y < frame->height; y += line_stride * 64) { |
| uint8_t *dest_y, *dest_cb, *dest_cr, *dest_a; |
| int last_dc[4] = { 1024, 1024, 1024, 1024 }; |
| uint8_t last_alpha[16]; |
| |
| memset(last_alpha, 255, sizeof(last_alpha)); |
| |
| dest_y = frame->data[0] + frame->linesize[0] * (y + field_number); |
| if (s->subsampling == SHQ_SUBSAMPLING_420) { |
| dest_cb = frame->data[1] + frame->linesize[1] * (y/2 + field_number); |
| dest_cr = frame->data[2] + frame->linesize[2] * (y/2 + field_number); |
| } else { |
| dest_cb = frame->data[1] + frame->linesize[1] * (y + field_number); |
| dest_cr = frame->data[2] + frame->linesize[2] * (y + field_number); |
| } |
| if (s->alpha_type != SHQ_NO_ALPHA) { |
| dest_a = frame->data[3] + frame->linesize[3] * (y + field_number); |
| } |
| |
| for (x = 0; x < frame->width; x += 16) { |
| /* Decode the four luma blocks. */ |
| if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y, linesize_y)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8, linesize_y)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8 * linesize_y, linesize_y)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8 * linesize_y + 8, linesize_y)) < 0) |
| return ret; |
| |
| /* |
| * Decode the first chroma block. For 4:2:0, this is the only one; |
| * for 4:2:2, it's the top block; for 4:4:4, it's the top-left block. |
| */ |
| if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb, linesize_cb)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr, linesize_cr)) < 0) |
| return ret; |
| |
| if (s->subsampling != SHQ_SUBSAMPLING_420) { |
| /* For 4:2:2, this is the bottom block; for 4:4:4, it's the bottom-left block. */ |
| if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8 * linesize_cb, linesize_cb)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8 * linesize_cr, linesize_cr)) < 0) |
| return ret; |
| |
| if (s->subsampling == SHQ_SUBSAMPLING_444) { |
| /* Top-right and bottom-right blocks. */ |
| if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8, linesize_cb)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8, linesize_cr)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8 * linesize_cb + 8, linesize_cb)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8 * linesize_cr + 8, linesize_cr)) < 0) |
| return ret; |
| |
| dest_cb += 8; |
| dest_cr += 8; |
| } |
| } |
| dest_y += 16; |
| dest_cb += 8; |
| dest_cr += 8; |
| |
| if (s->alpha_type == SHQ_RLE_ALPHA) { |
| /* Alpha coded using 16x8 RLE blocks. */ |
| if ((ret = decode_alpha_block(s, &gb, last_alpha, dest_a, linesize_a)) < 0) |
| return ret; |
| if ((ret = decode_alpha_block(s, &gb, last_alpha, dest_a + 8 * linesize_a, linesize_a)) < 0) |
| return ret; |
| dest_a += 16; |
| } else if (s->alpha_type == SHQ_DCT_ALPHA) { |
| /* Alpha encoded exactly like luma. */ |
| if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a, linesize_a)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8, linesize_a)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8 * linesize_a, linesize_a)) < 0) |
| return ret; |
| if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8 * linesize_a + 8, linesize_a)) < 0) |
| return ret; |
| dest_a += 16; |
| } |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void compute_quant_matrix(int *output, int qscale) |
| { |
| int i; |
| for (i = 0; i < 64; i++) output[i] = unscaled_quant_matrix[ff_zigzag_direct[i]] * qscale; |
| } |
| |
| static int speedhq_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| SHQContext * const s = avctx->priv_data; |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| AVFrame *frame = data; |
| uint8_t quality; |
| uint32_t second_field_offset; |
| int ret; |
| |
| if (buf_size < 4) |
| return AVERROR_INVALIDDATA; |
| |
| quality = buf[0]; |
| if (quality >= 100) { |
| return AVERROR_INVALIDDATA; |
| } |
| |
| compute_quant_matrix(s->quant_matrix, 100 - quality); |
| |
| second_field_offset = AV_RL24(buf + 1); |
| if (second_field_offset >= buf_size - 3) { |
| return AVERROR_INVALIDDATA; |
| } |
| |
| avctx->coded_width = FFALIGN(avctx->width, 16); |
| avctx->coded_height = FFALIGN(avctx->height, 16); |
| |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { |
| return ret; |
| } |
| frame->key_frame = 1; |
| |
| if (second_field_offset == 4) { |
| /* |
| * Overlapping first and second fields is used to signal |
| * encoding only a single field. In this case, "height" |
| * is ambiguous; it could mean either the height of the |
| * frame as a whole, or of the field. The former would make |
| * more sense for compatibility with legacy decoders, |
| * but this matches the convention used in NDI, which is |
| * the primary user of this trick. |
| */ |
| if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 0, 4, buf_size, 1)) < 0) |
| return ret; |
| } else { |
| if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 0, 4, second_field_offset, 2)) < 0) |
| return ret; |
| if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 1, second_field_offset, buf_size, 2)) < 0) |
| return ret; |
| } |
| |
| *got_frame = 1; |
| return buf_size; |
| } |
| |
| /* |
| * Alpha VLC. Run and level are independently coded, and would be |
| * outside the default limits for MAX_RUN/MAX_LEVEL, so we don't |
| * bother with combining them into one table. |
| */ |
| static av_cold void compute_alpha_vlcs(void) |
| { |
| uint16_t run_code[134], level_code[266]; |
| uint8_t run_bits[134], level_bits[266]; |
| int16_t run_symbols[134], level_symbols[266]; |
| int entry, i, sign; |
| |
| /* Initialize VLC for alpha run. */ |
| entry = 0; |
| |
| /* 0 -> 0. */ |
| run_code[entry] = 0; |
| run_bits[entry] = 1; |
| run_symbols[entry] = 0; |
| ++entry; |
| |
| /* 10xx -> xx plus 1. */ |
| for (i = 0; i < 4; ++i) { |
| run_code[entry] = (i << 2) | 1; |
| run_bits[entry] = 4; |
| run_symbols[entry] = i + 1; |
| ++entry; |
| } |
| |
| /* 111xxxxxxx -> xxxxxxx. */ |
| for (i = 0; i < 128; ++i) { |
| run_code[entry] = (i << 3) | 7; |
| run_bits[entry] = 10; |
| run_symbols[entry] = i; |
| ++entry; |
| } |
| |
| /* 110 -> EOB. */ |
| run_code[entry] = 3; |
| run_bits[entry] = 3; |
| run_symbols[entry] = -1; |
| ++entry; |
| |
| av_assert0(entry == FF_ARRAY_ELEMS(run_code)); |
| |
| INIT_LE_VLC_SPARSE_STATIC(&ff_dc_alpha_run_vlc_le, ALPHA_VLC_BITS, |
| FF_ARRAY_ELEMS(run_code), |
| run_bits, 1, 1, |
| run_code, 2, 2, |
| run_symbols, 2, 2, 160); |
| |
| /* Initialize VLC for alpha level. */ |
| entry = 0; |
| |
| for (sign = 0; sign <= 1; ++sign) { |
| /* 1s -> -1 or +1 (depending on sign bit). */ |
| level_code[entry] = (sign << 1) | 1; |
| level_bits[entry] = 2; |
| level_symbols[entry] = sign ? -1 : 1; |
| ++entry; |
| |
| /* 01sxx -> xx plus 2 (2..5 or -2..-5, depending on sign bit). */ |
| for (i = 0; i < 4; ++i) { |
| level_code[entry] = (i << 3) | (sign << 2) | 2; |
| level_bits[entry] = 5; |
| level_symbols[entry] = sign ? -(i + 2) : (i + 2); |
| ++entry; |
| } |
| } |
| |
| /* |
| * 00xxxxxxxx -> xxxxxxxx, in two's complement. There are many codes |
| * here that would better be encoded in other ways (e.g. 0 would be |
| * encoded by increasing run, and +/- 1 would be encoded with a |
| * shorter code), but it doesn't hurt to allow everything. |
| */ |
| for (i = 0; i < 256; ++i) { |
| level_code[entry] = i << 2; |
| level_bits[entry] = 10; |
| level_symbols[entry] = i; |
| ++entry; |
| } |
| |
| av_assert0(entry == FF_ARRAY_ELEMS(level_code)); |
| |
| INIT_LE_VLC_SPARSE_STATIC(&ff_dc_alpha_level_vlc_le, ALPHA_VLC_BITS, |
| FF_ARRAY_ELEMS(level_code), |
| level_bits, 1, 1, |
| level_code, 2, 2, |
| level_symbols, 2, 2, 288); |
| } |
| |
| static uint32_t reverse(uint32_t num, int bits) |
| { |
| return bitswap_32(num) >> (32 - bits); |
| } |
| |
| static void reverse_code(const uint16_t *code, const uint8_t *bits, |
| uint16_t *reversed_code, int num_entries) |
| { |
| int i; |
| for (i = 0; i < num_entries; i++) { |
| reversed_code[i] = reverse(code[i], bits[i]); |
| } |
| } |
| |
| static av_cold void speedhq_static_init(void) |
| { |
| uint16_t ff_mpeg12_vlc_dc_lum_code_reversed[12]; |
| uint16_t ff_mpeg12_vlc_dc_chroma_code_reversed[12]; |
| |
| /* Exactly the same as MPEG-2, except little-endian. */ |
| reverse_code(ff_mpeg12_vlc_dc_lum_code, |
| ff_mpeg12_vlc_dc_lum_bits, |
| ff_mpeg12_vlc_dc_lum_code_reversed, |
| 12); |
| INIT_LE_VLC_STATIC(&ff_dc_lum_vlc_le, DC_VLC_BITS, 12, |
| ff_mpeg12_vlc_dc_lum_bits, 1, 1, |
| ff_mpeg12_vlc_dc_lum_code_reversed, 2, 2, 512); |
| reverse_code(ff_mpeg12_vlc_dc_chroma_code, |
| ff_mpeg12_vlc_dc_chroma_bits, |
| ff_mpeg12_vlc_dc_chroma_code_reversed, |
| 12); |
| INIT_LE_VLC_STATIC(&ff_dc_chroma_vlc_le, DC_VLC_BITS, 12, |
| ff_mpeg12_vlc_dc_chroma_bits, 1, 1, |
| ff_mpeg12_vlc_dc_chroma_code_reversed, 2, 2, 514); |
| |
| ff_rl_init(&ff_rl_speedhq, ff_speedhq_static_rl_table_store); |
| INIT_2D_VLC_RL(ff_rl_speedhq, 674, INIT_VLC_LE); |
| |
| compute_alpha_vlcs(); |
| } |
| |
| static av_cold int speedhq_decode_init(AVCodecContext *avctx) |
| { |
| int ret; |
| static AVOnce init_once = AV_ONCE_INIT; |
| SHQContext * const s = avctx->priv_data; |
| |
| s->avctx = avctx; |
| |
| ret = ff_thread_once(&init_once, speedhq_static_init); |
| if (ret) |
| return AVERROR_UNKNOWN; |
| |
| ff_blockdsp_init(&s->bdsp, avctx); |
| ff_idctdsp_init(&s->idsp, avctx); |
| ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); |
| |
| switch (avctx->codec_tag) { |
| case MKTAG('S', 'H', 'Q', '0'): |
| s->subsampling = SHQ_SUBSAMPLING_420; |
| s->alpha_type = SHQ_NO_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| break; |
| case MKTAG('S', 'H', 'Q', '1'): |
| s->subsampling = SHQ_SUBSAMPLING_420; |
| s->alpha_type = SHQ_RLE_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUVA420P; |
| break; |
| case MKTAG('S', 'H', 'Q', '2'): |
| s->subsampling = SHQ_SUBSAMPLING_422; |
| s->alpha_type = SHQ_NO_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| break; |
| case MKTAG('S', 'H', 'Q', '3'): |
| s->subsampling = SHQ_SUBSAMPLING_422; |
| s->alpha_type = SHQ_RLE_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUVA422P; |
| break; |
| case MKTAG('S', 'H', 'Q', '4'): |
| s->subsampling = SHQ_SUBSAMPLING_444; |
| s->alpha_type = SHQ_NO_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUV444P; |
| break; |
| case MKTAG('S', 'H', 'Q', '5'): |
| s->subsampling = SHQ_SUBSAMPLING_444; |
| s->alpha_type = SHQ_RLE_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUVA444P; |
| break; |
| case MKTAG('S', 'H', 'Q', '7'): |
| s->subsampling = SHQ_SUBSAMPLING_422; |
| s->alpha_type = SHQ_DCT_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUVA422P; |
| break; |
| case MKTAG('S', 'H', 'Q', '9'): |
| s->subsampling = SHQ_SUBSAMPLING_444; |
| s->alpha_type = SHQ_DCT_ALPHA; |
| avctx->pix_fmt = AV_PIX_FMT_YUVA444P; |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "Unknown NewTek SpeedHQ FOURCC provided (%08X)\n", |
| avctx->codec_tag); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* This matches what NDI's RGB -> Y'CbCr 4:2:2 converter uses. */ |
| avctx->colorspace = AVCOL_SPC_BT470BG; |
| avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; |
| |
| return 0; |
| } |
| |
| AVCodec ff_speedhq_decoder = { |
| .name = "speedhq", |
| .long_name = NULL_IF_CONFIG_SMALL("NewTek SpeedHQ"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_SPEEDHQ, |
| .priv_data_size = sizeof(SHQContext), |
| .init = speedhq_decode_init, |
| .decode = speedhq_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
