2 * Canopus Lossless Codec decoder
4 * Copyright (c) 2012-2013 Derek Buitenhuis
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libavutil/intreadwrite.h"
33 typedef struct CLLCContext {
34 AVCodecContext *avctx;
41 static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
46 int num_lens, num_codes, num_codes_sum, prefix;
53 num_lens = get_bits(gb, 5);
55 for (i = 0; i < num_lens; i++) {
56 num_codes = get_bits(gb, 9);
57 num_codes_sum += num_codes;
59 if (num_codes_sum > 256) {
62 av_log(ctx->avctx, AV_LOG_ERROR,
63 "Too many VLCs (%d) to be read.\n", num_codes_sum);
64 return AVERROR_INVALIDDATA;
67 for (j = 0; j < num_codes; j++) {
68 symbols[count] = get_bits(gb, 8);
70 codes[count] = prefix++;
78 return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1,
79 codes, 2, 2, symbols, 1, 1, 0);
83 * Unlike the RGB24 read/restore, which reads in a component at a time,
84 * ARGB read/restore reads in ARGB quads.
86 static int read_argb_line(CLLCContext *ctx, GetBitContext *gb, int *top_left,
87 VLC *vlc, uint8_t *outbuf)
94 OPEN_READER(bits, gb);
97 pred[0] = top_left[0];
98 pred[1] = top_left[1];
99 pred[2] = top_left[2];
100 pred[3] = top_left[3];
102 for (i = 0; i < ctx->avctx->width; i++) {
103 /* Always get the alpha component */
104 UPDATE_CACHE(bits, gb);
105 GET_VLC(code, bits, gb, vlc[0].table, 7, 2);
110 /* Skip the components if they are entirely transparent */
113 UPDATE_CACHE(bits, gb);
114 GET_VLC(code, bits, gb, vlc[1].table, 7, 2);
120 UPDATE_CACHE(bits, gb);
121 GET_VLC(code, bits, gb, vlc[2].table, 7, 2);
127 UPDATE_CACHE(bits, gb);
128 GET_VLC(code, bits, gb, vlc[3].table, 7, 2);
141 CLOSE_READER(bits, gb);
143 top_left[0] = outbuf[0];
145 /* Only stash components if they are not transparent */
147 top_left[1] = outbuf[1];
148 top_left[2] = outbuf[2];
149 top_left[3] = outbuf[3];
155 static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb,
156 int *top_left, VLC *vlc, uint8_t *outbuf)
162 OPEN_READER(bits, gb);
167 /* Simultaneously read and restore the line */
168 for (i = 0; i < ctx->avctx->width; i++) {
169 UPDATE_CACHE(bits, gb);
170 GET_VLC(code, bits, gb, vlc->table, 7, 2);
177 CLOSE_READER(bits, gb);
179 /* Stash the first pixel */
180 *top_left = outbuf[0];
185 static int read_yuv_component_line(CLLCContext *ctx, GetBitContext *gb,
186 int *top_left, VLC *vlc, uint8_t *outbuf,
192 OPEN_READER(bits, gb);
196 /* Simultaneously read and restore the line */
197 for (i = 0; i < ctx->avctx->width >> is_chroma; i++) {
198 UPDATE_CACHE(bits, gb);
199 GET_VLC(code, bits, gb, vlc->table, 7, 2);
205 CLOSE_READER(bits, gb);
207 /* Stash the first pixel */
208 *top_left = outbuf[0];
213 static int decode_argb_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
215 AVCodecContext *avctx = ctx->avctx;
231 /* Read in code table for each plane */
232 for (i = 0; i < 4; i++) {
233 ret = read_code_table(ctx, gb, &vlc[i]);
235 for (j = 0; j <= i; j++)
236 ff_free_vlc(&vlc[j]);
238 av_log(ctx->avctx, AV_LOG_ERROR,
239 "Could not read code table %d.\n", i);
244 /* Read in and restore every line */
245 for (i = 0; i < avctx->height; i++) {
246 read_argb_line(ctx, gb, pred, vlc, dst);
248 dst += pic->linesize[0];
251 for (i = 0; i < 4; i++)
252 ff_free_vlc(&vlc[i]);
257 static int decode_rgb24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
259 AVCodecContext *avctx = ctx->avctx;
274 /* Read in code table for each plane */
275 for (i = 0; i < 3; i++) {
276 ret = read_code_table(ctx, gb, &vlc[i]);
278 for (j = 0; j <= i; j++)
279 ff_free_vlc(&vlc[j]);
281 av_log(ctx->avctx, AV_LOG_ERROR,
282 "Could not read code table %d.\n", i);
287 /* Read in and restore every line */
288 for (i = 0; i < avctx->height; i++) {
289 for (j = 0; j < 3; j++)
290 read_rgb24_component_line(ctx, gb, &pred[j], &vlc[j], &dst[j]);
292 dst += pic->linesize[0];
295 for (i = 0; i < 3; i++)
296 ff_free_vlc(&vlc[i]);
301 static int decode_yuv_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
303 AVCodecContext *avctx = ctx->avctx;
315 dst[0] = pic->data[0];
316 dst[1] = pic->data[1];
317 dst[2] = pic->data[2];
321 block = get_bits(gb, 8);
323 avpriv_request_sample(ctx->avctx, "Blocked YUV");
324 return AVERROR_PATCHWELCOME;
327 /* Read in code table for luma and chroma */
328 for (i = 0; i < 2; i++) {
329 ret = read_code_table(ctx, gb, &vlc[i]);
331 for (j = 0; j <= i; j++)
332 ff_free_vlc(&vlc[j]);
334 av_log(ctx->avctx, AV_LOG_ERROR,
335 "Could not read code table %d.\n", i);
340 /* Read in and restore every line */
341 for (i = 0; i < avctx->height; i++) {
342 read_yuv_component_line(ctx, gb, &pred[0], &vlc[0], dst[0], 0); /* Y */
343 read_yuv_component_line(ctx, gb, &pred[1], &vlc[1], dst[1], 1); /* U */
344 read_yuv_component_line(ctx, gb, &pred[2], &vlc[1], dst[2], 1); /* V */
346 for (j = 0; j < 3; j++)
347 dst[j] += pic->linesize[j];
350 for (i = 0; i < 2; i++)
351 ff_free_vlc(&vlc[i]);
356 static int cllc_decode_frame(AVCodecContext *avctx, void *data,
357 int *got_picture_ptr, AVPacket *avpkt)
359 CLLCContext *ctx = avctx->priv_data;
361 ThreadFrame frame = { .f = data };
362 uint8_t *src = avpkt->data;
363 uint32_t info_tag, info_offset;
366 int coding_type, ret;
368 if (avpkt->size < 4 + 4) {
369 av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
370 return AVERROR_INVALIDDATA;
374 info_tag = AV_RL32(src);
375 if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
376 info_offset = AV_RL32(src + 4);
377 if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {
378 av_log(avctx, AV_LOG_ERROR,
379 "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",
381 return AVERROR_INVALIDDATA;
383 ff_canopus_parse_info_tag(avctx, src + 8, info_offset);
389 data_size = (avpkt->size - info_offset) & ~1;
391 /* Make sure our bswap16'd buffer is big enough */
392 av_fast_padded_malloc(&ctx->swapped_buf,
393 &ctx->swapped_buf_size, data_size);
394 if (!ctx->swapped_buf) {
395 av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n");
396 return AVERROR(ENOMEM);
399 /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */
400 ctx->bdsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src,
403 if ((ret = init_get_bits8(&gb, ctx->swapped_buf, data_size)) < 0)
407 * Read in coding type. The types are as follows:
410 * 1 - BGR24 (Triples)
414 coding_type = (AV_RL32(src) >> 8) & 0xFF;
415 av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type);
417 switch (coding_type) {
419 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
420 avctx->bits_per_raw_sample = 8;
422 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
425 ret = decode_yuv_frame(ctx, &gb, pic);
432 avctx->pix_fmt = AV_PIX_FMT_RGB24;
433 avctx->bits_per_raw_sample = 8;
435 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
438 ret = decode_rgb24_frame(ctx, &gb, pic);
444 avctx->pix_fmt = AV_PIX_FMT_ARGB;
445 avctx->bits_per_raw_sample = 8;
447 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
450 ret = decode_argb_frame(ctx, &gb, pic);
456 av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type);
457 return AVERROR_INVALIDDATA;
461 pic->pict_type = AV_PICTURE_TYPE_I;
463 *got_picture_ptr = 1;
469 static int cllc_init_thread_copy(AVCodecContext *avctx)
471 CLLCContext *ctx = avctx->priv_data;
474 ctx->swapped_buf = NULL;
475 ctx->swapped_buf_size = 0;
481 static av_cold int cllc_decode_close(AVCodecContext *avctx)
483 CLLCContext *ctx = avctx->priv_data;
485 av_freep(&ctx->swapped_buf);
490 static av_cold int cllc_decode_init(AVCodecContext *avctx)
492 CLLCContext *ctx = avctx->priv_data;
494 /* Initialize various context values */
496 ctx->swapped_buf = NULL;
497 ctx->swapped_buf_size = 0;
499 ff_bswapdsp_init(&ctx->bdsp);
504 AVCodec ff_cllc_decoder = {
506 .long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"),
507 .type = AVMEDIA_TYPE_VIDEO,
508 .id = AV_CODEC_ID_CLLC,
509 .priv_data_size = sizeof(CLLCContext),
510 .init = cllc_decode_init,
511 .init_thread_copy = ONLY_IF_THREADS_ENABLED(cllc_init_thread_copy),
512 .decode = cllc_decode_frame,
513 .close = cllc_decode_close,
514 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
515 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,