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-rw-r--r--libavcodec/speedhq.c687
1 files changed, 687 insertions, 0 deletions
diff --git a/libavcodec/speedhq.c b/libavcodec/speedhq.c
new file mode 100644
index 0000000000..60efb0222b
--- /dev/null
+++ b/libavcodec/speedhq.c
@@ -0,0 +1,687 @@
+/*
+ * 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 uint16_t speedhq_vlc[123][2] = {
+ {0x02, 2}, {0x06, 3}, {0x07, 4}, {0x1c, 5},
+ {0x1d, 5}, {0x05, 6}, {0x04, 6}, {0x7b, 7},
+ {0x7c, 7}, {0x23, 8}, {0x22, 8}, {0xfa, 8},
+ {0xfb, 8}, {0xfe, 8}, {0xff, 8}, {0x1f,14},
+ {0x1e,14}, {0x1d,14}, {0x1c,14}, {0x1b,14},
+ {0x1a,14}, {0x19,14}, {0x18,14}, {0x17,14},
+ {0x16,14}, {0x15,14}, {0x14,14}, {0x13,14},
+ {0x12,14}, {0x11,14}, {0x10,14}, {0x18,15},
+ {0x17,15}, {0x16,15}, {0x15,15}, {0x14,15},
+ {0x13,15}, {0x12,15}, {0x11,15}, {0x10,15},
+ {0x02, 3}, {0x06, 5}, {0x79, 7}, {0x27, 8},
+ {0x20, 8}, {0x16,13}, {0x15,13}, {0x1f,15},
+ {0x1e,15}, {0x1d,15}, {0x1c,15}, {0x1b,15},
+ {0x1a,15}, {0x19,15}, {0x13,16}, {0x12,16},
+ {0x11,16}, {0x10,16}, {0x18,13}, {0x17,13},
+ {0x05, 5}, {0x07, 7}, {0xfc, 8}, {0x0c,10},
+ {0x14,13}, {0x18,12}, {0x14,12}, {0x13,12},
+ {0x10,12}, {0x1a,13}, {0x19,13}, {0x07, 5},
+ {0x26, 8}, {0x1c,12}, {0x13,13}, {0x1b,12},
+ {0x06, 6}, {0xfd, 8}, {0x12,12}, {0x1d,12},
+ {0x07, 6}, {0x04, 9}, {0x12,13}, {0x06, 7},
+ {0x1e,12}, {0x14,16}, {0x04, 7}, {0x15,12},
+ {0x05, 7}, {0x11,12}, {0x78, 7}, {0x11,13},
+ {0x7a, 7}, {0x10,13}, {0x21, 8}, {0x1a,16},
+ {0x25, 8}, {0x19,16}, {0x24, 8}, {0x18,16},
+ {0x05, 9}, {0x17,16}, {0x07, 9}, {0x16,16},
+ {0x0d,10}, {0x15,16}, {0x1f,12}, {0x1a,12},
+ {0x19,12}, {0x17,12}, {0x16,12}, {0x1f,13},
+ {0x1e,13}, {0x1d,13}, {0x1c,13}, {0x1b,13},
+ {0x1f,16}, {0x1e,16}, {0x1d,16}, {0x1c,16},
+ {0x1b,16},
+ {0x01,6}, /* escape */
+ {0x06,4}, /* 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_16(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 (the second field then comes
+ * as a separate, later frame).
+ */
+ frame->height >>= 1;
+ 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];
+ int i;
+
+ /* 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);
+
+ /* Reverse the AC VLC, because INIT_VLC_LE wants it in that order. */
+ for (i = 0; i < FF_ARRAY_ELEMS(speedhq_vlc); ++i) {
+ speedhq_vlc[i][0] = reverse(speedhq_vlc[i][0], speedhq_vlc[i][1]);
+ }
+ 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,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-13 15:41:22 +0000