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ffmpeg/libavcodec/cllc.c

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/*
* Canopus Lossless Codec decoder
*
* Copyright (c) 2012 Derek Buitenhuis
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "dsputil.h"
#include "get_bits.h"
#include "avcodec.h"
typedef struct CLLCContext {
DSPContext dsp;
AVCodecContext *avctx;
uint8_t *swapped_buf;
int swapped_buf_size;
} CLLCContext;
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;
prefix = 0;
count = 0;
num_codes_sum = 0;
num_lens = get_bits(gb, 5);
for (i = 0; i < num_lens; i++) {
num_codes = get_bits(gb, 9);
num_codes_sum += num_codes;
if (num_codes_sum > 256) {
vlc->table = NULL;
av_log(ctx->avctx, AV_LOG_ERROR,
"Too many VLCs (%d) to be read.\n", num_codes_sum);
return AVERROR_INVALIDDATA;
}
for (j = 0; j < num_codes; j++) {
symbols[count] = get_bits(gb, 8);
bits[count] = i + 1;
codes[count] = prefix++;
count++;
}
prefix <<= 1;
}
return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1,
codes, 2, 2, symbols, 1, 1, 0);
}
/*
* Unlike the RGB24 read/restore, which reads in a component at a time,
* ARGB read/restore reads in ARGB quads.
*/
static int read_argb_line(CLLCContext *ctx, GetBitContext *gb, int *top_left,
VLC *vlc, uint8_t *outbuf)
{
uint8_t *dst;
int pred[4];
int code;
int i;
OPEN_READER(bits, gb);
dst = outbuf;
pred[0] = top_left[0];
pred[1] = top_left[1];
pred[2] = top_left[2];
pred[3] = top_left[3];
for (i = 0; i < ctx->avctx->width; i++) {
/* Always get the alpha component */
UPDATE_CACHE(bits, gb);
GET_VLC(code, bits, gb, vlc[0].table, 7, 2);
pred[0] += code;
dst[0] = pred[0];
/* Skip the components if they are entirely transparent */
if (dst[0]) {
/* Red */
UPDATE_CACHE(bits, gb);
GET_VLC(code, bits, gb, vlc[1].table, 7, 2);
pred[1] += code;
dst[1] = pred[1];
/* Green */
UPDATE_CACHE(bits, gb);
GET_VLC(code, bits, gb, vlc[2].table, 7, 2);
pred[2] += code;
dst[2] = pred[2];
/* Blue */
UPDATE_CACHE(bits, gb);
GET_VLC(code, bits, gb, vlc[3].table, 7, 2);
pred[3] += code;
dst[3] = pred[3];
} else {
dst[1] = 0;
dst[2] = 0;
dst[3] = 0;
}
dst += 4;
}
CLOSE_READER(bits, gb);
dst -= 4 * ctx->avctx->width;
top_left[0] = dst[0];
/* Only stash components if they are not transparent */
if (top_left[0]) {
top_left[1] = dst[1];
top_left[2] = dst[2];
top_left[3] = dst[3];
}
return 0;
}
static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb,
int *top_left, VLC *vlc, uint8_t *outbuf)
{
uint8_t *dst;
int pred, code;
int i;
OPEN_READER(bits, gb);
dst = outbuf;
pred = *top_left;
/* 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);
pred += code;
dst[0] = pred;
dst += 3;
}
CLOSE_READER(bits, gb);
/* Stash the first pixel */
*top_left = dst[-3 * ctx->avctx->width];
return 0;
}
static int decode_argb_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
{
AVCodecContext *avctx = ctx->avctx;
uint8_t *dst;
int pred[4];
int ret;
int i, j;
VLC vlc[4];
pred[0] = 0;
pred[1] = 0x80;
pred[2] = 0x80;
pred[3] = 0x80;
dst = pic->data[0];
skip_bits(gb, 16);
/* Read in code table for each plane */
for (i = 0; i < 4; i++) {
ret = read_code_table(ctx, gb, &vlc[i]);
if (ret < 0) {
for (j = 0; j <= i; j++)
ff_free_vlc(&vlc[j]);
av_log(ctx->avctx, AV_LOG_ERROR,
"Could not read code table %d.\n", i);
return ret;
}
}
/* Read in and restore every line */
for (i = 0; i < avctx->height; i++) {
read_argb_line(ctx, gb, pred, vlc, dst);
dst += pic->linesize[0];
}
for (i = 0; i < 4; i++)
ff_free_vlc(&vlc[i]);
return 0;
}
static int decode_rgb24_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];
pred[0] = 0x80;
pred[1] = 0x80;
pred[2] = 0x80;
dst = pic->data[0];
skip_bits(gb, 16);
/* 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]);
av_log(ctx->avctx, AV_LOG_ERROR,
"Could not read code table %d.\n", i);
return ret;
}
}
/* Read in and restore every line */
for (i = 0; i < avctx->height; i++) {
for (j = 0; j < 3; j++)
read_rgb24_component_line(ctx, gb, &pred[j], &vlc[j], &dst[j]);
dst += pic->linesize[0];
}
for (i = 0; i < 3; i++)
ff_free_vlc(&vlc[i]);
return 0;
}
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;
uint32_t info_tag, info_offset;
int data_size;
GetBitContext gb;
int coding_type, ret;
if (pic->data[0])
avctx->release_buffer(avctx, pic);
pic->reference = 0;
/* 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;
}
info_offset += 8;
src += info_offset;
av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n");
}
data_size = (avpkt->size - info_offset) & ~1;
/* Make sure our bswap16'd buffer is big enough */
av_fast_padded_malloc(&ctx->swapped_buf,
&ctx->swapped_buf_size, data_size);
if (!ctx->swapped_buf) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n");
return AVERROR(ENOMEM);
}
/* bswap16 the buffer since CLLC's bitreader works in 16-bit words */
ctx->dsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src,
data_size / 2);
init_get_bits(&gb, ctx->swapped_buf, data_size * 8);
/*
* 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);
switch (coding_type) {
case 1:
case 2:
avctx->pix_fmt = PIX_FMT_RGB24;
avctx->bits_per_raw_sample = 8;
ret = avctx->get_buffer(avctx, pic);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
return ret;
}
ret = decode_rgb24_frame(ctx, &gb, pic);
if (ret < 0)
return ret;
break;
case 3:
avctx->pix_fmt = PIX_FMT_ARGB;
avctx->bits_per_raw_sample = 8;
ret = avctx->get_buffer(avctx, pic);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
return ret;
}
ret = decode_argb_frame(ctx, &gb, pic);
if (ret < 0)
return ret;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type);
return AVERROR_INVALIDDATA;
}
pic->key_frame = 1;
pic->pict_type = AV_PICTURE_TYPE_I;
*got_picture_ptr = 1;
*(AVFrame *)data = *pic;
return avpkt->size;
}
static av_cold int cllc_decode_close(AVCodecContext *avctx)
{
CLLCContext *ctx = avctx->priv_data;
if (avctx->coded_frame->data[0])
avctx->release_buffer(avctx, avctx->coded_frame);
av_freep(&avctx->coded_frame);
av_freep(&ctx->swapped_buf);
return 0;
}
static av_cold int cllc_decode_init(AVCodecContext *avctx)
{
CLLCContext *ctx = avctx->priv_data;
/* Initialize various context values */
ctx->avctx = avctx;
ctx->swapped_buf = NULL;
ctx->swapped_buf_size = 0;
ff_dsputil_init(&ctx->dsp, avctx);
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
return AVERROR(ENOMEM);
}
return 0;
}
AVCodec ff_cllc_decoder = {
.name = "cllc",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_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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