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FFmpeg/libavcodec/hq_hqa.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* 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 "codec_internal.h"
#include "get_bits.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) * 64;
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) * 64;
}
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]] = (int)(ff_hq_ac_syms[val] * (unsigned)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 %"SIZE_SPECIFIER".\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;
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
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;
if (bytestream2_get_bytes_left(&ctx->gbc) < 8 + 4*(num_slices + 1))
return AVERROR_INVALIDDATA;
width = bytestream2_get_be16(&ctx->gbc);
height = bytestream2_get_be16(&ctx->gbc);
ret = ff_set_dimensions(ctx->avctx, width, height);
if (ret < 0)
return ret;
ctx->avctx->coded_width = FFALIGN(width, 16);
ctx->avctx->coded_height = FFALIGN(height, 16);
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 %"SIZE_SPECIFIER".\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 (info_size < 0 || 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;
}
const FFCodec ff_hq_hqa_decoder = {
.p.name = "hq_hqa",
.p.long_name = NULL_IF_CONFIG_SMALL("Canopus HQ/HQA"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.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,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};
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