/*
* Canopus HQ/HQA decoder
*
* 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
*/
#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "canopus.h"
#include "internal.h"
#include "hq_hqa.h"
#include "hq_hqadsp.h"
/* HQ/HQA slices are a set of macroblocks belonging to a frame, and
* they usually form a pseudorandom pattern (probably because it is
* nicer to display on partial decode).
*
* For HQA it just happens that each slice is on every 8th macroblock,
* but they can be on any frame width like
* X.......X.
* ......X...
* ....X.....
* ..X.......
* etc.
*
* The original decoder has special handling for edge macroblocks,
* while lavc simply aligns coded_width and coded_height.
*/
static inline void put_blocks(HQContext *c, AVFrame *pic,
int plane, int x, int y, int ilace,
int16_t *block0, int16_t *block1)
{
uint8_t *p = pic->data[plane] + x;
c->hqhqadsp.idct_put(p + y * pic->linesize[plane],
pic->linesize[plane] << ilace, block0);
c->hqhqadsp.idct_put(p + (y + (ilace ? 1 : 8)) * pic->linesize[plane],
pic->linesize[plane] << ilace, block1);
}
static int hq_decode_block(HQContext *c, GetBitContext *gb, int16_t block[64],
int qsel, int is_chroma, int is_hqa)
{
const int32_t *q;
int val, pos = 1;
memset(block
, 0, 64 * sizeof(*block
));
if (!is_hqa) {
block[0] = get_sbits(gb, 9) << 6;
q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)];
} else {
q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)];
block[0] = get_sbits(gb, 9) << 6;
}
for (;;) {
val = get_vlc2(gb, c->hq_ac_vlc.table, 9, 2);
if (val < 0)
return AVERROR_INVALIDDATA;
pos += ff_hq_ac_skips[val];
if (pos >= 64)
break;
block[ff_zigzag_direct[pos]] = (ff_hq_ac_syms[val] * q[pos]) >> 12;
pos++;
}
return 0;
}
static int hq_decode_mb(HQContext *c, AVFrame *pic,
GetBitContext *gb, int x, int y)
{
int qgroup, flag;
int i, ret;
qgroup = get_bits(gb, 4);
flag = get_bits1(gb);
for (i = 0; i < 8; i++) {
ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 4, 0);
if (ret < 0)
return ret;
}
put_blocks(c, pic, 0, x, y, flag, c->block[0], c->block[2]);
put_blocks(c, pic, 0, x + 8, y, flag, c->block[1], c->block[3]);
put_blocks(c, pic, 2, x >> 1, y, flag, c->block[4], c->block[5]);
put_blocks(c, pic, 1, x >> 1, y, flag, c->block[6], c->block[7]);
return 0;
}
static int hq_decode_frame(HQContext *ctx, AVFrame *pic,
int prof_num, size_t data_size)
{
const HQProfile *profile;
GetBitContext gb;
const uint8_t *perm, *src = ctx->gbc.buffer;
uint32_t slice_off[21];
int slice, start_off, next_off, i, ret;
if ((unsigned)prof_num >= NUM_HQ_PROFILES) {
profile = &ff_hq_profile[0];
avpriv_request_sample(ctx->avctx, "HQ Profile %d", prof_num);
} else {
profile = &ff_hq_profile[prof_num];
av_log(ctx->avctx, AV_LOG_VERBOSE, "HQ Profile %d\n", prof_num);
}
ctx->avctx->coded_width = FFALIGN(profile->width, 16);
ctx->avctx->coded_height = FFALIGN(profile->height, 16);
ctx->avctx->width = profile->width;
ctx->avctx->height = profile->height;
ctx->avctx->bits_per_raw_sample = 8;
ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
ret = ff_get_buffer(ctx->avctx, pic, 0);
if (ret < 0)
return ret;
/* Offsets are stored from CUV position, so adjust them accordingly. */
for (i = 0; i < profile->num_slices + 1; i++)
slice_off[i] = bytestream2_get_be24(&ctx->gbc) - 4;
next_off = 0;
for (slice = 0; slice < profile->num_slices; slice++) {
start_off = next_off;
next_off = profile->tab_h * (slice + 1) / profile->num_slices;
perm = profile->perm_tab + start_off * profile->tab_w * 2;
if (slice_off[slice] < (profile->num_slices + 1) * 3 ||
slice_off[slice] >= slice_off[slice + 1] ||
slice_off[slice + 1] > data_size) {
av_log(ctx->avctx, AV_LOG_ERROR,
"Invalid slice size %zu.\n", data_size);
break;
}
init_get_bits(&gb, src + slice_off[slice],
(slice_off[slice + 1] - slice_off[slice]) * 8);
for (i = 0; i < (next_off - start_off) * profile->tab_w; i++) {
ret = hq_decode_mb(ctx, pic, &gb, perm[0] * 16, perm[1] * 16);
if (ret < 0) {
av_log(ctx->avctx, AV_LOG_ERROR,
"Error decoding macroblock %d at slice %d.\n", i, slice);
return ret;
}
perm += 2;
}
}
return 0;
}
static int hqa_decode_mb(HQContext *c, AVFrame *pic, int qgroup,
GetBitContext *gb, int x, int y)
{
int flag = 0;
int i, ret, cbp;
cbp = get_vlc2(gb, c->hqa_cbp_vlc.table, 5, 1);
for (i = 0; i < 12; i++)
memset(c
->block
[i
], 0, sizeof(*c
->block
)); for (i = 0; i < 12; i++)
c->block[i][0] = -128 * (1 << 6);
if (cbp) {
flag = get_bits1(gb);
cbp |= cbp << 4;
if (cbp & 0x3)
cbp |= 0x500;
if (cbp & 0xC)
cbp |= 0xA00;
for (i = 0; i < 12; i++) {
if (!(cbp & (1 << i)))
continue;
ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 8, 1);
if (ret < 0)
return ret;
}
}
put_blocks(c, pic, 3, x, y, flag, c->block[ 0], c->block[ 2]);
put_blocks(c, pic, 3, x + 8, y, flag, c->block[ 1], c->block[ 3]);
put_blocks(c, pic, 0, x, y, flag, c->block[ 4], c->block[ 6]);
put_blocks(c, pic, 0, x + 8, y, flag, c->block[ 5], c->block[ 7]);
put_blocks(c, pic, 2, x >> 1, y, flag, c->block[ 8], c->block[ 9]);
put_blocks(c, pic, 1, x >> 1, y, flag, c->block[10], c->block[11]);
return 0;
}
static int hqa_decode_slice(HQContext *ctx, AVFrame *pic, GetBitContext *gb,
int quant, int slice_no, int w, int h)
{
int i, j, off;
int ret;
for (i = 0; i < h; i += 16) {
off = (slice_no * 16 + i * 3) & 0x70;
for (j = off; j < w; j += 128) {
ret = hqa_decode_mb(ctx, pic, quant, gb, j, i);
if (ret < 0) {
av_log(ctx->avctx, AV_LOG_ERROR,
"Error decoding macroblock at %dx%d.\n", i, j);
return ret;
}
}
}
return 0;
}
static int hqa_decode_frame(HQContext *ctx, AVFrame *pic, size_t data_size)
{
GetBitContext gb;
const int num_slices = 8;
uint32_t slice_off[9];
int i, slice, ret;
int width, height, quant;
const uint8_t *src = ctx->gbc.buffer;
width = bytestream2_get_be16(&ctx->gbc);
height = bytestream2_get_be16(&ctx->gbc);
ctx->avctx->coded_width = FFALIGN(width, 16);
ctx->avctx->coded_height = FFALIGN(height, 16);
ctx->avctx->width = width;
ctx->avctx->height = height;
ctx->avctx->bits_per_raw_sample = 8;
ctx->avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
av_log(ctx->avctx, AV_LOG_VERBOSE, "HQA Profile\n");
quant = bytestream2_get_byte(&ctx->gbc);
bytestream2_skip(&ctx->gbc, 3);
if (quant >= NUM_HQ_QUANTS) {
av_log(ctx->avctx, AV_LOG_ERROR,
"Invalid quantization matrix %d.\n", quant);
return AVERROR_INVALIDDATA;
}
ret = ff_get_buffer(ctx->avctx, pic, 0);
if (ret < 0)
return ret;
/* Offsets are stored from HQA1 position, so adjust them accordingly. */
for (i = 0; i < num_slices + 1; i++)
slice_off[i] = bytestream2_get_be32(&ctx->gbc) - 4;
for (slice = 0; slice < num_slices; slice++) {
if (slice_off[slice] < (num_slices + 1) * 3 ||
slice_off[slice] >= slice_off[slice + 1] ||
slice_off[slice + 1] > data_size) {
av_log(ctx->avctx, AV_LOG_ERROR,
"Invalid slice size %zu.\n", data_size);
break;
}
init_get_bits(&gb, src + slice_off[slice],
(slice_off[slice + 1] - slice_off[slice]) * 8);
ret = hqa_decode_slice(ctx, pic, &gb, quant, slice, width, height);
if (ret < 0)
return ret;
}
return 0;
}
static int hq_hqa_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
HQContext *ctx = avctx->priv_data;
AVFrame *pic = data;
uint32_t info_tag;
unsigned int data_size;
int ret;
unsigned tag;
bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", avpkt->size);
return AVERROR_INVALIDDATA;
}
info_tag = bytestream2_peek_le32(&ctx->gbc);
if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
int info_size;
bytestream2_skip(&ctx->gbc, 4);
info_size = bytestream2_get_le32(&ctx->gbc);
if (bytestream2_get_bytes_left(&ctx->gbc) < info_size) {
av_log(avctx, AV_LOG_ERROR, "Invalid INFO size (%d).\n", info_size);
return AVERROR_INVALIDDATA;
}
ff_canopus_parse_info_tag(avctx, ctx->gbc.buffer, info_size);
bytestream2_skip(&ctx->gbc, info_size);
}
data_size = bytestream2_get_bytes_left(&ctx->gbc);
if (data_size < 4) {
av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", data_size);
return AVERROR_INVALIDDATA;
}
/* HQ defines dimensions and number of slices, and thus slice traversal
* order. HQA has no size constraint and a fixed number of slices, so it
* needs a separate scheme for it. */
tag = bytestream2_get_le32(&ctx->gbc);
if ((tag & 0x00FFFFFF) == (MKTAG('U', 'V', 'C', ' ') & 0x00FFFFFF)) {
ret = hq_decode_frame(ctx, pic, tag >> 24, data_size);
} else if (tag == MKTAG('H', 'Q', 'A', '1')) {
ret = hqa_decode_frame(ctx, pic, data_size);
} else {
av_log(avctx, AV_LOG_ERROR, "Not a HQ/HQA frame.\n");
return AVERROR_INVALIDDATA;
}
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error decoding frame.\n");
return ret;
}
pic->key_frame = 1;
pic->pict_type = AV_PICTURE_TYPE_I;
*got_frame = 1;
return avpkt->size;
}
static av_cold int hq_hqa_decode_init(AVCodecContext *avctx)
{
HQContext *ctx = avctx->priv_data;
ctx->avctx = avctx;
ff_hqdsp_init(&ctx->hqhqadsp);
return ff_hq_init_vlcs(ctx);
}
static av_cold int hq_hqa_decode_close(AVCodecContext *avctx)
{
HQContext *ctx = avctx->priv_data;
ff_free_vlc(&ctx->hq_ac_vlc);
ff_free_vlc(&ctx->hqa_cbp_vlc);
return 0;
}
AVCodec ff_hq_hqa_decoder = {
.name = "hq_hqa",
.long_name = NULL_IF_CONFIG_SMALL("Canopus HQ/HQA"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_HQ_HQA,
.priv_data_size = sizeof(HQContext),
.init = hq_hqa_decode_init,
.decode = hq_hqa_decode_frame,
.close = hq_hqa_decode_close,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};