| /* |
| * QuickTime Graphics (SMC) Video Encoder |
| * Copyright (c) 2021 The FFmpeg project |
| * |
| * 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 smcenc.c |
| * QT SMC Video Encoder by Paul B. Mahol |
| */ |
| |
| #include "libavutil/common.h" |
| |
| #include "avcodec.h" |
| #include "codec_internal.h" |
| #include "encode.h" |
| #include "bytestream.h" |
| |
| #define CPAIR 2 |
| #define CQUAD 4 |
| #define COCTET 8 |
| |
| #define COLORS_PER_TABLE 256 |
| |
| typedef struct SMCContext { |
| AVFrame *prev_frame; // buffer for previous source frame |
| |
| uint8_t mono_value; |
| int nb_distinct; |
| int next_nb_distinct; |
| uint8_t distinct_values[16]; |
| uint8_t next_distinct_values[16]; |
| |
| uint8_t color_pairs[COLORS_PER_TABLE][CPAIR]; |
| uint8_t color_quads[COLORS_PER_TABLE][CQUAD]; |
| uint8_t color_octets[COLORS_PER_TABLE][COCTET]; |
| |
| int key_frame; |
| } SMCContext; |
| |
| #define ADVANCE_BLOCK(pixel_ptr, row_ptr, nb_blocks) \ |
| { \ |
| for (int block = 0; block < nb_blocks && pixel_ptr && row_ptr; block++) { \ |
| pixel_ptr += 4; \ |
| cur_x += 4; \ |
| if (pixel_ptr - row_ptr >= width) \ |
| { \ |
| row_ptr += stride * 4; \ |
| pixel_ptr = row_ptr; \ |
| cur_y += 4; \ |
| cur_x = 0; \ |
| } \ |
| } \ |
| } |
| |
| static int smc_cmp_values(const void *a, const void *b) |
| { |
| const uint8_t *aa = a, *bb = b; |
| |
| return FFDIFFSIGN(aa[0], bb[0]); |
| } |
| |
| static int count_distinct_items(const uint8_t *block_values, |
| uint8_t *distinct_values, |
| int size) |
| { |
| int n = 1; |
| |
| distinct_values[0] = block_values[0]; |
| for (int i = 1; i < size; i++) { |
| if (block_values[i] != block_values[i-1]) { |
| distinct_values[n] = block_values[i]; |
| n++; |
| } |
| } |
| |
| return n; |
| } |
| |
| #define CACHE_PAIR(x) \ |
| (s->color_pairs[i][0] == distinct_values[x] || \ |
| s->color_pairs[i][1] == distinct_values[x]) |
| |
| #define CACHE_QUAD(x) \ |
| (s->color_quads[i][0] == distinct_values[x] || \ |
| s->color_quads[i][1] == distinct_values[x] || \ |
| s->color_quads[i][2] == distinct_values[x] || \ |
| s->color_quads[i][3] == distinct_values[x]) |
| |
| #define CACHE_OCTET(x) \ |
| (s->color_octets[i][0] == distinct_values[x] || \ |
| s->color_octets[i][1] == distinct_values[x] || \ |
| s->color_octets[i][2] == distinct_values[x] || \ |
| s->color_octets[i][3] == distinct_values[x] || \ |
| s->color_octets[i][4] == distinct_values[x] || \ |
| s->color_octets[i][5] == distinct_values[x] || \ |
| s->color_octets[i][6] == distinct_values[x] || \ |
| s->color_octets[i][7] == distinct_values[x]) |
| |
| static void smc_encode_stream(SMCContext *s, const AVFrame *frame, |
| PutByteContext *pb) |
| { |
| const uint8_t *src_pixels = (const uint8_t *)frame->data[0]; |
| const ptrdiff_t stride = frame->linesize[0]; |
| const uint8_t *prev_pixels = (const uint8_t *)s->prev_frame->data[0]; |
| const ptrdiff_t prev_stride = s->prev_frame->linesize[0]; |
| uint8_t *distinct_values = s->distinct_values; |
| const uint8_t *pixel_ptr, *row_ptr; |
| const int height = frame->height; |
| const int width = frame->width; |
| int block_counter = 0; |
| int color_pair_index = 0; |
| int color_quad_index = 0; |
| int color_octet_index = 0; |
| int color_table_index; /* indexes to color pair, quad, or octet tables */ |
| int total_blocks; |
| int cur_y = 0; |
| int cur_x = 0; |
| |
| /* Number of 4x4 blocks in frame. */ |
| total_blocks = ((width + 3) / 4) * ((height + 3) / 4); |
| |
| pixel_ptr = row_ptr = src_pixels; |
| |
| while (block_counter < total_blocks) { |
| const uint8_t *xpixel_ptr = pixel_ptr; |
| const uint8_t *xrow_ptr = row_ptr; |
| int intra_skip_blocks = 0; |
| int inter_skip_blocks = 0; |
| int coded_distinct = 0; |
| int coded_blocks = 0; |
| int cache_index; |
| int distinct = 0; |
| int blocks = 0; |
| int frame_y = cur_y; |
| int frame_x = cur_x; |
| |
| while (prev_pixels && s->key_frame == 0 && block_counter + inter_skip_blocks < total_blocks) { |
| const int y_size = FFMIN(4, height - cur_y); |
| const int x_size = FFMIN(4, width - cur_x); |
| int compare = 0; |
| |
| for (int y = 0; y < y_size; y++) { |
| const uint8_t *prev_pixel_ptr = prev_pixels + (y + cur_y) * prev_stride + cur_x; |
| |
| compare |= !!memcmp(prev_pixel_ptr, pixel_ptr + y * stride, x_size); |
| if (compare) |
| break; |
| } |
| |
| if (compare) |
| break; |
| |
| inter_skip_blocks++; |
| if (inter_skip_blocks >= 256) |
| break; |
| |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, 1) |
| } |
| |
| pixel_ptr = xpixel_ptr; |
| row_ptr = xrow_ptr; |
| cur_y = frame_y; |
| cur_x = frame_x; |
| |
| while (block_counter > 0 && block_counter + intra_skip_blocks < total_blocks) { |
| const int y_size = FFMIN(4, height - cur_y); |
| const int x_size = FFMIN(4, width - cur_x); |
| const ptrdiff_t offset = xpixel_ptr - src_pixels; |
| const int sy = offset / stride; |
| const int sx = offset % stride; |
| const int ny = sx < 4 ? sy - 4 : sy; |
| const int nx = sx < 4 ? width - 4 + (width & 3) : sx - 4; |
| const uint8_t *old_pixel_ptr = src_pixels + nx + ny * stride; |
| int compare = 0; |
| |
| for (int y = 0; y < y_size; y++) { |
| compare |= !!memcmp(old_pixel_ptr + y * stride, pixel_ptr + y * stride, x_size); |
| if (compare) |
| break; |
| } |
| |
| if (compare) |
| break; |
| |
| intra_skip_blocks++; |
| if (intra_skip_blocks >= 256) |
| break; |
| |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, 1) |
| } |
| |
| pixel_ptr = xpixel_ptr; |
| row_ptr = xrow_ptr; |
| cur_y = frame_y; |
| cur_x = frame_x; |
| |
| while (block_counter + coded_blocks < total_blocks && coded_blocks < 256) { |
| const int y_size = FFMIN(4, height - cur_y); |
| const int x_size = FFMIN(4, width - cur_x); |
| const int nb_elements = x_size * y_size; |
| uint8_t block_values[16] = { 0 }; |
| for (int y = 0; y < y_size; y++) |
| memcpy(block_values + y * x_size, pixel_ptr + y * stride, x_size); |
| |
| qsort(block_values, nb_elements, sizeof(block_values[0]), smc_cmp_values); |
| s->next_nb_distinct = count_distinct_items(block_values, s->next_distinct_values, nb_elements); |
| if (coded_blocks == 0) { |
| memcpy(distinct_values, s->next_distinct_values, sizeof(s->distinct_values)); |
| s->nb_distinct = s->next_nb_distinct; |
| } else { |
| if (s->next_nb_distinct != s->nb_distinct || |
| memcmp(distinct_values, s->next_distinct_values, s->nb_distinct)) { |
| break; |
| } |
| } |
| s->mono_value = block_values[0]; |
| |
| coded_distinct = s->nb_distinct; |
| coded_blocks++; |
| if (coded_distinct > 1 && coded_blocks >= 16) |
| break; |
| |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, 1) |
| } |
| |
| pixel_ptr = xpixel_ptr; |
| row_ptr = xrow_ptr; |
| cur_y = frame_y; |
| cur_x = frame_x; |
| |
| blocks = coded_distinct <= 8 ? coded_blocks : 0; |
| distinct = coded_distinct; |
| |
| if (intra_skip_blocks >= blocks && intra_skip_blocks >= inter_skip_blocks) { |
| distinct = 17; |
| blocks = intra_skip_blocks; |
| } |
| |
| if (intra_skip_blocks > 16 && intra_skip_blocks >= inter_skip_blocks && |
| intra_skip_blocks >= blocks) { |
| distinct = 18; |
| blocks = intra_skip_blocks; |
| } |
| |
| if (inter_skip_blocks >= blocks && inter_skip_blocks > intra_skip_blocks) { |
| distinct = 19; |
| blocks = inter_skip_blocks; |
| } |
| |
| if (inter_skip_blocks > 16 && inter_skip_blocks > intra_skip_blocks && |
| inter_skip_blocks >= blocks) { |
| distinct = 20; |
| blocks = inter_skip_blocks; |
| } |
| |
| if (blocks == 0) { |
| blocks = coded_blocks; |
| distinct = coded_distinct; |
| } |
| |
| switch (distinct) { |
| case 1: |
| if (blocks <= 16) { |
| bytestream2_put_byte(pb, 0x60 | (blocks - 1)); |
| } else { |
| bytestream2_put_byte(pb, 0x70); |
| bytestream2_put_byte(pb, blocks - 1); |
| } |
| bytestream2_put_byte(pb, s->mono_value); |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks) |
| break; |
| case 2: |
| cache_index = -1; |
| for (int i = 0; i < COLORS_PER_TABLE; i++) { |
| if (CACHE_PAIR(0) && |
| CACHE_PAIR(1)) { |
| cache_index = i; |
| break; |
| } |
| } |
| |
| if (cache_index >= 0) { |
| bytestream2_put_byte(pb, 0x90 | (blocks - 1)); |
| bytestream2_put_byte(pb, cache_index); |
| color_table_index = cache_index; |
| } else { |
| bytestream2_put_byte(pb, 0x80 | (blocks - 1)); |
| |
| color_table_index = color_pair_index; |
| for (int i = 0; i < CPAIR; i++) { |
| s->color_pairs[color_table_index][i] = distinct_values[i]; |
| bytestream2_put_byte(pb, distinct_values[i]); |
| } |
| |
| color_pair_index++; |
| if (color_pair_index == COLORS_PER_TABLE) |
| color_pair_index = 0; |
| } |
| |
| for (int i = 0; i < blocks; i++) { |
| const int y_size = FFMIN(4, height - cur_y); |
| const int x_size = FFMIN(4, width - cur_x); |
| uint8_t value = s->color_pairs[color_table_index][1]; |
| uint16_t flags = 0; |
| int shift = 15; |
| |
| for (int y = 0; y < y_size; y++) { |
| for (int x = 0; x < x_size; x++) { |
| flags |= (value == pixel_ptr[x + y * stride]) << shift; |
| shift--; |
| } |
| shift -= 4 - x_size; |
| } |
| |
| bytestream2_put_be16(pb, flags); |
| |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, 1) |
| } |
| break; |
| case 3: |
| case 4: |
| cache_index = -1; |
| for (int i = 0; i < COLORS_PER_TABLE; i++) { |
| if (CACHE_QUAD(0) && |
| CACHE_QUAD(1) && |
| CACHE_QUAD(2) && |
| CACHE_QUAD(3)) { |
| cache_index = i; |
| break; |
| } |
| } |
| |
| if (cache_index >= 0) { |
| bytestream2_put_byte(pb, 0xB0 | (blocks - 1)); |
| bytestream2_put_byte(pb, cache_index); |
| color_table_index = cache_index; |
| } else { |
| bytestream2_put_byte(pb, 0xA0 | (blocks - 1)); |
| |
| color_table_index = color_quad_index; |
| for (int i = 0; i < CQUAD; i++) { |
| s->color_quads[color_table_index][i] = distinct_values[i]; |
| bytestream2_put_byte(pb, distinct_values[i]); |
| } |
| |
| color_quad_index++; |
| if (color_quad_index == COLORS_PER_TABLE) |
| color_quad_index = 0; |
| } |
| |
| for (int i = 0; i < blocks; i++) { |
| const int y_size = FFMIN(4, height - cur_y); |
| const int x_size = FFMIN(4, width - cur_x); |
| uint32_t flags = 0; |
| uint8_t quad[4]; |
| int shift = 30; |
| |
| for (int k = 0; k < 4; k++) |
| quad[k] = s->color_quads[color_table_index][k]; |
| |
| for (int y = 0; y < y_size; y++) { |
| for (int x = 0; x < x_size; x++) { |
| int pixel = pixel_ptr[x + y * stride]; |
| uint32_t idx = 0; |
| |
| for (int w = 0; w < CQUAD; w++) { |
| if (quad[w] == pixel) { |
| idx = w; |
| break; |
| } |
| } |
| |
| flags |= idx << shift; |
| shift -= 2; |
| } |
| |
| shift -= 2 * (4 - x_size); |
| } |
| |
| bytestream2_put_be32(pb, flags); |
| |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, 1) |
| } |
| break; |
| case 5: |
| case 6: |
| case 7: |
| case 8: |
| cache_index = -1; |
| for (int i = 0; i < COLORS_PER_TABLE; i++) { |
| if (CACHE_OCTET(0) && |
| CACHE_OCTET(1) && |
| CACHE_OCTET(2) && |
| CACHE_OCTET(3) && |
| CACHE_OCTET(4) && |
| CACHE_OCTET(5) && |
| CACHE_OCTET(6) && |
| CACHE_OCTET(7)) { |
| cache_index = i; |
| break; |
| } |
| } |
| |
| if (cache_index >= 0) { |
| bytestream2_put_byte(pb, 0xD0 | (blocks - 1)); |
| bytestream2_put_byte(pb, cache_index); |
| color_table_index = cache_index; |
| } else { |
| bytestream2_put_byte(pb, 0xC0 | (blocks - 1)); |
| |
| color_table_index = color_octet_index; |
| for (int i = 0; i < COCTET; i++) { |
| s->color_octets[color_table_index][i] = distinct_values[i]; |
| bytestream2_put_byte(pb, distinct_values[i]); |
| } |
| |
| color_octet_index++; |
| if (color_octet_index == COLORS_PER_TABLE) |
| color_octet_index = 0; |
| } |
| |
| for (int i = 0; i < blocks; i++) { |
| const int y_size = FFMIN(4, height - cur_y); |
| const int x_size = FFMIN(4, width - cur_x); |
| uint64_t flags = 0; |
| uint8_t octet[8]; |
| int shift = 45; |
| |
| for (int k = 0; k < 8; k++) |
| octet[k] = s->color_octets[color_table_index][k]; |
| |
| for (int y = 0; y < y_size; y++) { |
| for (int x = 0; x < x_size; x++) { |
| int pixel = pixel_ptr[x + y * stride]; |
| uint64_t idx = 0; |
| |
| for (int w = 0; w < COCTET; w++) { |
| if (octet[w] == pixel) { |
| idx = w; |
| break; |
| } |
| } |
| |
| flags |= idx << shift; |
| shift -= 3; |
| } |
| |
| shift -= 3 * (4 - x_size); |
| } |
| |
| bytestream2_put_be16(pb, ((flags >> 32) & 0xFFF0) | ((flags >> 8) & 0xF)); |
| bytestream2_put_be16(pb, ((flags >> 20) & 0xFFF0) | ((flags >> 4) & 0xF)); |
| bytestream2_put_be16(pb, ((flags >> 8) & 0xFFF0) | ((flags >> 0) & 0xF)); |
| |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, 1) |
| } |
| break; |
| default: |
| bytestream2_put_byte(pb, 0xE0 | (blocks - 1)); |
| for (int i = 0; i < blocks; i++) { |
| const int y_size = FFMIN(4, height - cur_y); |
| const int x_size = FFMIN(4, width - cur_x); |
| for (int y = 0; y < y_size; y++) { |
| for (int x = 0; x < x_size; x++) |
| bytestream2_put_byte(pb, pixel_ptr[x + y * stride]); |
| for (int x = x_size; x < 4; x++) |
| bytestream2_put_byte(pb, 0); |
| } |
| |
| for (int y = y_size; y < 4; y++) { |
| for (int x = 0; x < 4; x++) |
| bytestream2_put_byte(pb, 0); |
| } |
| |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, 1) |
| } |
| break; |
| case 17: |
| bytestream2_put_byte(pb, 0x20 | (blocks - 1)); |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks) |
| break; |
| case 18: |
| bytestream2_put_byte(pb, 0x30); |
| bytestream2_put_byte(pb, blocks - 1); |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks) |
| break; |
| case 19: |
| bytestream2_put_byte(pb, 0x00 | (blocks - 1)); |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks) |
| break; |
| case 20: |
| bytestream2_put_byte(pb, 0x10); |
| bytestream2_put_byte(pb, blocks - 1); |
| ADVANCE_BLOCK(pixel_ptr, row_ptr, blocks) |
| break; |
| } |
| |
| block_counter += blocks; |
| } |
| } |
| |
| static int smc_encode_init(AVCodecContext *avctx) |
| { |
| SMCContext *s = avctx->priv_data; |
| |
| avctx->bits_per_coded_sample = 8; |
| |
| s->prev_frame = av_frame_alloc(); |
| if (!s->prev_frame) |
| return AVERROR(ENOMEM); |
| |
| return 0; |
| } |
| |
| static int smc_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
| const AVFrame *frame, int *got_packet) |
| { |
| SMCContext *s = avctx->priv_data; |
| const AVFrame *pict = frame; |
| PutByteContext pb; |
| uint8_t *pal; |
| int ret; |
| |
| ret = ff_alloc_packet(avctx, pkt, 8LL * avctx->height * avctx->width); |
| if (ret < 0) |
| return ret; |
| |
| if (avctx->gop_size == 0 || !s->prev_frame->data[0] || |
| (avctx->frame_num % avctx->gop_size) == 0) { |
| s->key_frame = 1; |
| } else { |
| s->key_frame = 0; |
| } |
| |
| bytestream2_init_writer(&pb, pkt->data, pkt->size); |
| |
| bytestream2_put_be32(&pb, 0x00); |
| |
| pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); |
| if (!pal) |
| return AVERROR(ENOMEM); |
| memcpy(pal, frame->data[1], AVPALETTE_SIZE); |
| |
| smc_encode_stream(s, pict, &pb); |
| |
| av_shrink_packet(pkt, bytestream2_tell_p(&pb)); |
| |
| pkt->data[0] = 0x0; |
| |
| // write chunk length |
| AV_WB24(pkt->data + 1, pkt->size); |
| |
| ret = av_frame_replace(s->prev_frame, frame); |
| if (ret < 0) { |
| av_log(avctx, AV_LOG_ERROR, "cannot add reference\n"); |
| return ret; |
| } |
| |
| if (s->key_frame) |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| *got_packet = 1; |
| |
| return 0; |
| } |
| |
| static int smc_encode_end(AVCodecContext *avctx) |
| { |
| SMCContext *s = avctx->priv_data; |
| |
| av_frame_free(&s->prev_frame); |
| |
| return 0; |
| } |
| |
| const FFCodec ff_smc_encoder = { |
| .p.name = "smc", |
| CODEC_LONG_NAME("QuickTime Graphics (SMC)"), |
| .p.type = AVMEDIA_TYPE_VIDEO, |
| .p.id = AV_CODEC_ID_SMC, |
| .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, |
| .priv_data_size = sizeof(SMCContext), |
| .init = smc_encode_init, |
| FF_CODEC_ENCODE_CB(smc_encode_frame), |
| .close = smc_encode_end, |
| .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_PAL8, |
| AV_PIX_FMT_NONE}, |
| }; |