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At the moment it only does BGR24, but I plan to add the rest after. Signed-off-by: Derek Buitenhuis <[email protected]>
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/* | ||
* Canopus Lossless Codec decoder | ||
* | ||
* Copyright (c) 2012 Derek Buitenhuis | ||
* | ||
* 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 | ||
*/ | ||
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#include "libavutil/intreadwrite.h" | ||
#include "dsputil.h" | ||
#include "get_bits.h" | ||
#include "avcodec.h" | ||
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typedef struct CLLCContext { | ||
DSPContext dsp; | ||
AVCodecContext *avctx; | ||
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uint8_t *swapped_buf; | ||
int swapped_buf_size; | ||
} CLLCContext; | ||
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static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc) | ||
{ | ||
uint8_t symbols[256]; | ||
uint8_t bits[256]; | ||
uint16_t codes[256]; | ||
int num_lens, num_codes, num_codes_sum, prefix; | ||
int i, j, count; | ||
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prefix = 0; | ||
count = 0; | ||
num_codes_sum = 0; | ||
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num_lens = get_bits(gb, 5); | ||
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for (i = 0; i < num_lens; i++) { | ||
num_codes = get_bits(gb, 9); | ||
num_codes_sum += num_codes; | ||
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if (num_codes_sum > 256) { | ||
vlc->table = NULL; | ||
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av_log(ctx->avctx, AV_LOG_ERROR, | ||
"Too many VLCs (%d) to be read.\n", num_codes_sum); | ||
return AVERROR_INVALIDDATA; | ||
} | ||
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for (j = 0; j < num_codes; j++) { | ||
symbols[count] = get_bits(gb, 8); | ||
bits[count] = i + 1; | ||
codes[count] = prefix++; | ||
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count++; | ||
} | ||
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prefix <<= 1; | ||
} | ||
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return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1, | ||
codes, 2, 2, symbols, 1, 1, 0); | ||
} | ||
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static int read_line(CLLCContext *ctx, GetBitContext *gb, int *top_left, | ||
VLC *vlc, uint8_t *outbuf) | ||
{ | ||
uint8_t *dst; | ||
int pred, code; | ||
int i; | ||
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OPEN_READER(bits, gb); | ||
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dst = outbuf; | ||
pred = *top_left; | ||
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/* Simultaneously read and restore the line */ | ||
for (i = 0; i < ctx->avctx->width; i++) { | ||
UPDATE_CACHE(bits, gb); | ||
GET_VLC(code, bits, gb, vlc->table, 7, 2); | ||
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pred += code; | ||
dst[0] = pred; | ||
dst += 3; | ||
} | ||
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CLOSE_READER(bits, gb); | ||
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/* Stash the first pixel */ | ||
*top_left = dst[-3 * ctx->avctx->width]; | ||
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return 0; | ||
} | ||
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static int decode_bgr24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) | ||
{ | ||
AVCodecContext *avctx = ctx->avctx; | ||
uint8_t *dst; | ||
int pred[3]; | ||
int ret; | ||
int i, j; | ||
VLC vlc[3]; | ||
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pred[0] = 0x80; | ||
pred[1] = 0x80; | ||
pred[2] = 0x80; | ||
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dst = pic->data[0]; | ||
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skip_bits(gb, 16); | ||
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/* Read in code table for each plane */ | ||
for (i = 0; i < 3; i++) { | ||
ret = read_code_table(ctx, gb, &vlc[i]); | ||
if (ret < 0) { | ||
for (j = 0; j <= i; j++) | ||
ff_free_vlc(&vlc[j]); | ||
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av_log(ctx->avctx, AV_LOG_ERROR, | ||
"Could not read code table %d.\n", i); | ||
return ret; | ||
} | ||
} | ||
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/* Read in and restore every line */ | ||
for (i = 0; i < avctx->height; i++) { | ||
for (j = 0; j < 3; j++) | ||
read_line(ctx, gb, &pred[j], &vlc[j], &dst[j]); | ||
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dst += pic->linesize[0]; | ||
} | ||
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for (i = 0; i < 3; i++) | ||
ff_free_vlc(&vlc[i]); | ||
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return 0; | ||
} | ||
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static int cllc_decode_frame(AVCodecContext *avctx, void *data, | ||
int *got_picture_ptr, AVPacket *avpkt) | ||
{ | ||
CLLCContext *ctx = avctx->priv_data; | ||
AVFrame *pic = avctx->coded_frame; | ||
uint8_t *src = avpkt->data; | ||
uint8_t *swapped_buf_new; | ||
uint32_t info_tag, info_offset; | ||
GetBitContext gb; | ||
int coding_type, ret; | ||
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if (pic->data[0]) | ||
avctx->release_buffer(avctx, pic); | ||
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pic->reference = 0; | ||
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/* Make sure our bswap16'd buffer is big enough */ | ||
swapped_buf_new = av_fast_realloc(ctx->swapped_buf, | ||
&ctx->swapped_buf_size, avpkt->size); | ||
if (!swapped_buf_new) { | ||
av_log(avctx, AV_LOG_ERROR, "Could not realloc swapped buffer.\n"); | ||
return AVERROR(ENOMEM); | ||
} | ||
ctx->swapped_buf = swapped_buf_new; | ||
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/* Skip the INFO header if present */ | ||
info_offset = 0; | ||
info_tag = AV_RL32(src); | ||
if (info_tag == MKTAG('I', 'N', 'F', 'O')) { | ||
info_offset = AV_RL32(src + 4); | ||
if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) { | ||
av_log(avctx, AV_LOG_ERROR, | ||
"Invalid INFO header offset: 0x%08X is too large.\n", | ||
info_offset); | ||
return AVERROR_INVALIDDATA; | ||
} | ||
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info_offset += 8; | ||
src += info_offset; | ||
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av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n"); | ||
} | ||
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/* bswap16 the buffer since CLLC's bitreader works in 16-bit words */ | ||
ctx->dsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src, | ||
(avpkt->size - info_offset) / 2); | ||
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init_get_bits(&gb, ctx->swapped_buf, (avpkt->size - info_offset) * 8); | ||
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/* | ||
* Read in coding type. The types are as follows: | ||
* | ||
* 0 - YUY2 | ||
* 1 - BGR24 (Triples) | ||
* 2 - BGR24 (Quads) | ||
* 3 - BGRA | ||
*/ | ||
coding_type = (AV_RL32(src) >> 8) & 0xFF; | ||
av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type); | ||
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switch (coding_type) { | ||
case 1: | ||
avctx->pix_fmt = PIX_FMT_RGB24; | ||
avctx->bits_per_raw_sample = 8; | ||
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ret = avctx->get_buffer(avctx, pic); | ||
if (ret < 0) { | ||
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); | ||
return ret; | ||
} | ||
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ret = decode_bgr24_frame(ctx, &gb, pic); | ||
if (ret < 0) | ||
return ret; | ||
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break; | ||
default: | ||
av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d\n.", coding_type); | ||
return AVERROR_INVALIDDATA; | ||
} | ||
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pic->key_frame = 1; | ||
pic->pict_type = AV_PICTURE_TYPE_I; | ||
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*got_picture_ptr = 1; | ||
*(AVFrame *)data = *pic; | ||
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return avpkt->size; | ||
} | ||
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static av_cold int cllc_decode_close(AVCodecContext *avctx) | ||
{ | ||
CLLCContext *ctx = avctx->priv_data; | ||
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if (avctx->coded_frame->data[0]) | ||
avctx->release_buffer(avctx, avctx->coded_frame); | ||
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av_freep(&avctx->coded_frame); | ||
av_freep(&ctx->swapped_buf); | ||
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return 0; | ||
} | ||
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static av_cold int cllc_decode_init(AVCodecContext *avctx) | ||
{ | ||
CLLCContext *ctx = avctx->priv_data; | ||
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/* Initialize various context values */ | ||
ctx->avctx = avctx; | ||
ctx->swapped_buf = NULL; | ||
ctx->swapped_buf_size = 0; | ||
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ff_dsputil_init(&ctx->dsp, avctx); | ||
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avctx->coded_frame = avcodec_alloc_frame(); | ||
if (!avctx->coded_frame) { | ||
av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n"); | ||
return AVERROR(ENOMEM); | ||
} | ||
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return 0; | ||
} | ||
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AVCodec ff_cllc_decoder = { | ||
.name = "cllc", | ||
.type = AVMEDIA_TYPE_VIDEO, | ||
.id = CODEC_ID_CLLC, | ||
.priv_data_size = sizeof(CLLCContext), | ||
.init = cllc_decode_init, | ||
.decode = cllc_decode_frame, | ||
.close = cllc_decode_close, | ||
.capabilities = CODEC_CAP_DR1, | ||
.long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"), | ||
}; |
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