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FFmpeg/libavcodec/ffv1_parse.c
Michael Niedermayer 171060d5dc avcodec/ffv1: 32-bit float sample support 
Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2025-03-24 13:46:58 +01:00

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/*
* 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 "libavutil/crc.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "rangecoder.h"
#include "ffv1.h"
static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
{
int v;
int i = 0;
uint8_t state[CONTEXT_SIZE];
memset(state, 128, sizeof(state));
for (v = 0; i < 128; v++) {
unsigned len = ff_ffv1_get_symbol(c, state, 0) + 1U;
if (len > 128 - i || !len)
return AVERROR_INVALIDDATA;
while (len--) {
quant_table[i] = scale * v;
i++;
}
}
for (i = 1; i < 128; i++)
quant_table[256 - i] = -quant_table[i];
quant_table[128] = -quant_table[127];
return 2 * v - 1;
}
int ff_ffv1_read_quant_tables(RangeCoder *c,
int16_t quant_table[MAX_CONTEXT_INPUTS][256])
{
int i;
int context_count = 1;
for (i = 0; i < 5; i++) {
int ret = read_quant_table(c, quant_table[i], context_count);
if (ret < 0)
return ret;
context_count *= ret;
if (context_count > 32768U) {
return AVERROR_INVALIDDATA;
}
}
return (context_count + 1) / 2;
}
int ff_ffv1_read_extra_header(FFV1Context *f)
{
RangeCoder c;
uint8_t state[CONTEXT_SIZE];
int ret;
uint8_t state2[32][CONTEXT_SIZE];
unsigned crc = 0;
memset(state2, 128, sizeof(state2));
memset(state, 128, sizeof(state));
ff_init_range_decoder(&c, f->avctx->extradata, f->avctx->extradata_size);
ff_build_rac_states(&c, 0.05 * (1LL << 32), 256 - 8);
f->version = ff_ffv1_get_symbol(&c, state, 0);
if (f->version < 2) {
av_log(f->avctx, AV_LOG_ERROR, "Invalid version in global header\n");
return AVERROR_INVALIDDATA;
}
if (f->version > 4) {
av_log(f->avctx, AV_LOG_ERROR, "unsupported version %d\n",
f->version);
return AVERROR_PATCHWELCOME;
}
f->combined_version = f->version << 16;
if (f->version > 2) {
c.bytestream_end -= 4;
f->micro_version = ff_ffv1_get_symbol(&c, state, 0);
if (f->micro_version < 0 || f->micro_version > 65535)
return AVERROR_INVALIDDATA;
f->combined_version += f->micro_version;
}
f->ac = ff_ffv1_get_symbol(&c, state, 0);
if (f->ac == AC_RANGE_CUSTOM_TAB) {
for (int i = 1; i < 256; i++)
f->state_transition[i] = ff_ffv1_get_symbol(&c, state, 1) + c.one_state[i];
} else {
RangeCoder rc;
ff_build_rac_states(&rc, 0.05 * (1LL << 32), 256 - 8);
for (int i = 1; i < 256; i++)
f->state_transition[i] = rc.one_state[i];
}
f->colorspace = ff_ffv1_get_symbol(&c, state, 0); //YUV cs type
f->avctx->bits_per_raw_sample = ff_ffv1_get_symbol(&c, state, 0);
f->chroma_planes = get_rac(&c, state);
f->chroma_h_shift = ff_ffv1_get_symbol(&c, state, 0);
f->chroma_v_shift = ff_ffv1_get_symbol(&c, state, 0);
f->transparency = get_rac(&c, state);
f->plane_count = 1 + (f->chroma_planes || f->version<4) + f->transparency;
f->num_h_slices = 1 + ff_ffv1_get_symbol(&c, state, 0);
f->num_v_slices = 1 + ff_ffv1_get_symbol(&c, state, 0);
if (f->chroma_h_shift > 4U || f->chroma_v_shift > 4U) {
av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
f->chroma_h_shift, f->chroma_v_shift);
return AVERROR_INVALIDDATA;
}
if (f->num_h_slices > (unsigned)f->width || !f->num_h_slices ||
f->num_v_slices > (unsigned)f->height || !f->num_v_slices
) {
av_log(f->avctx, AV_LOG_ERROR, "slice count invalid\n");
return AVERROR_INVALIDDATA;
}
if (f->num_h_slices > MAX_SLICES / f->num_v_slices) {
av_log(f->avctx, AV_LOG_ERROR, "slice count unsupported\n");
return AVERROR_PATCHWELCOME;
}
f->quant_table_count = ff_ffv1_get_symbol(&c, state, 0);
if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES || !f->quant_table_count) {
av_log(f->avctx, AV_LOG_ERROR, "quant table count %d is invalid\n", f->quant_table_count);
f->quant_table_count = 0;
return AVERROR_INVALIDDATA;
}
for (int i = 0; i < f->quant_table_count; i++) {
f->context_count[i] = ff_ffv1_read_quant_tables(&c, f->quant_tables[i]);
if (f->context_count[i] < 0) {
av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
return AVERROR_INVALIDDATA;
}
}
if ((ret = ff_ffv1_allocate_initial_states(f)) < 0)
return ret;
for (int i = 0; i < f->quant_table_count; i++)
if (get_rac(&c, state)) {
for (int j = 0; j < f->context_count[i]; j++)
for (int k = 0; k < CONTEXT_SIZE; k++) {
int pred = j ? f->initial_states[i][j - 1][k] : 128;
f->initial_states[i][j][k] =
(pred + ff_ffv1_get_symbol(&c, state2[k], 1)) & 0xFF;
}
}
if (f->version > 2) {
f->ec = ff_ffv1_get_symbol(&c, state, 0);
if (f->ec >= 2)
f->crcref = 0x7a8c4079;
if (f->combined_version >= 0x30003)
f->intra = ff_ffv1_get_symbol(&c, state, 0);
if (f->combined_version >= 0x40004)
f->flt = ff_ffv1_get_symbol(&c, state, 0);
}
if (f->version > 2) {
unsigned v;
v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), f->crcref,
f->avctx->extradata, f->avctx->extradata_size);
if (v != f->crcref || f->avctx->extradata_size < 4) {
av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
return AVERROR_INVALIDDATA;
}
crc = AV_RB32(f->avctx->extradata + f->avctx->extradata_size - 4);
}
if (f->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(f->avctx, AV_LOG_DEBUG,
"global: ver:%d.%d, coder:%d, colorspace: %d bpr:%d chroma:%d(%d:%d), alpha:%d slices:%dx%d qtabs:%d ec:%d intra:%d CRC:0x%08X\n",
f->version, f->micro_version,
f->ac,
f->colorspace,
f->avctx->bits_per_raw_sample,
f->chroma_planes, f->chroma_h_shift, f->chroma_v_shift,
f->transparency,
f->num_h_slices, f->num_v_slices,
f->quant_table_count,
f->ec,
f->intra,
crc
);
return 0;
}
int ff_ffv1_parse_header(FFV1Context *f, RangeCoder *c, uint8_t *state)
{
if (f->version < 2) {
int chroma_planes, chroma_h_shift, chroma_v_shift, transparency, colorspace, bits_per_raw_sample;
unsigned v= ff_ffv1_get_symbol(c, state, 0);
if (v >= 2) {
av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in ver01 header\n", v);
return AVERROR_INVALIDDATA;
}
f->version = v;
f->ac = ff_ffv1_get_symbol(c, state, 0);
if (f->ac == AC_RANGE_CUSTOM_TAB) {
for (int i = 1; i < 256; i++) {
int st = ff_ffv1_get_symbol(c, state, 1) + c->one_state[i];
if (st < 1 || st > 255) {
av_log(f->avctx, AV_LOG_ERROR, "invalid state transition %d\n", st);
return AVERROR_INVALIDDATA;
}
f->state_transition[i] = st;
}
} else {
RangeCoder rc;
ff_build_rac_states(&rc, 0.05 * (1LL << 32), 256 - 8);
for (int i = 1; i < 256; i++)
f->state_transition[i] = rc.one_state[i];
}
colorspace = ff_ffv1_get_symbol(c, state, 0); //YUV cs type
bits_per_raw_sample = f->version > 0 ? ff_ffv1_get_symbol(c, state, 0) : f->avctx->bits_per_raw_sample;
chroma_planes = get_rac(c, state);
chroma_h_shift = ff_ffv1_get_symbol(c, state, 0);
chroma_v_shift = ff_ffv1_get_symbol(c, state, 0);
transparency = get_rac(c, state);
if (colorspace == 0 && f->avctx->skip_alpha)
transparency = 0;
if (f->plane_count) {
if (colorspace != f->colorspace ||
bits_per_raw_sample != f->avctx->bits_per_raw_sample ||
chroma_planes != f->chroma_planes ||
chroma_h_shift != f->chroma_h_shift ||
chroma_v_shift != f->chroma_v_shift ||
transparency != f->transparency) {
av_log(f->avctx, AV_LOG_ERROR, "Invalid change of global parameters\n");
return AVERROR_INVALIDDATA;
}
}
if (chroma_h_shift > 4U || chroma_v_shift > 4U) {
av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
chroma_h_shift, chroma_v_shift);
return AVERROR_INVALIDDATA;
}
f->colorspace = colorspace;
f->avctx->bits_per_raw_sample = bits_per_raw_sample;
f->chroma_planes = chroma_planes;
f->chroma_h_shift = chroma_h_shift;
f->chroma_v_shift = chroma_v_shift;
f->transparency = transparency;
f->plane_count = 2 + f->transparency;
}
if (f->colorspace == 0) {
if (!f->transparency && !f->chroma_planes) {
if (f->avctx->bits_per_raw_sample <= 8)
f->pix_fmt = AV_PIX_FMT_GRAY8;
else if (f->avctx->bits_per_raw_sample == 9) {
f->packed_at_lsb = 1;
f->pix_fmt = AV_PIX_FMT_GRAY9;
} else if (f->avctx->bits_per_raw_sample == 10) {
f->packed_at_lsb = 1;
f->pix_fmt = AV_PIX_FMT_GRAY10;
} else if (f->avctx->bits_per_raw_sample == 12) {
f->packed_at_lsb = 1;
f->pix_fmt = AV_PIX_FMT_GRAY12;
} else if (f->avctx->bits_per_raw_sample == 14) {
f->packed_at_lsb = 1;
f->pix_fmt = AV_PIX_FMT_GRAY14;
} else if (f->avctx->bits_per_raw_sample == 16) {
f->packed_at_lsb = 1;
if (f->flt) {
f->pix_fmt = AV_PIX_FMT_GRAYF16;
} else
f->pix_fmt = AV_PIX_FMT_GRAY16;
} else if (f->avctx->bits_per_raw_sample < 16) {
f->pix_fmt = AV_PIX_FMT_GRAY16;
} else
return AVERROR(ENOSYS);
} else if (f->transparency && !f->chroma_planes) {
if (f->avctx->bits_per_raw_sample <= 8 && !f->flt) {
f->pix_fmt = AV_PIX_FMT_YA8;
} else if (f->avctx->bits_per_raw_sample == 16 && f->flt) {
f->pix_fmt = AV_PIX_FMT_YAF16;
} else
return AVERROR(ENOSYS);
} else if (f->avctx->bits_per_raw_sample<=8 && !f->transparency) {
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P; break;
case 0x01: f->pix_fmt = AV_PIX_FMT_YUV440P; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P; break;
case 0x20: f->pix_fmt = AV_PIX_FMT_YUV411P; break;
case 0x22: f->pix_fmt = AV_PIX_FMT_YUV410P; break;
}
} else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {
switch(16*f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P; break;
}
} else if (f->avctx->bits_per_raw_sample == 9 && !f->transparency) {
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P9; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P9; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P9; break;
}
} else if (f->avctx->bits_per_raw_sample == 9 && f->transparency) {
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P9; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P9; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P9; break;
}
} else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency) {
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P10; break;
case 0x01: f->pix_fmt = AV_PIX_FMT_YUV440P10; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P10; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P10; break;
}
} else if (f->avctx->bits_per_raw_sample == 10 && f->transparency) {
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P10; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P10; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P10; break;
}
} else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency) {
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P12; break;
case 0x01: f->pix_fmt = AV_PIX_FMT_YUV440P12; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P12; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P12; break;
}
} else if (f->avctx->bits_per_raw_sample == 12 && f->transparency) {
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P12; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P12; break;
}
} else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency) {
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P14; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P14; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P14; break;
}
} else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency){
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P16; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P16; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P16; break;
}
} else if (f->avctx->bits_per_raw_sample == 16 && f->transparency){
f->packed_at_lsb = 1;
switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P16; break;
case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P16; break;
case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P16; break;
}
}
} else if (f->colorspace == 1) {
if (f->chroma_h_shift || f->chroma_v_shift) {
av_log(f->avctx, AV_LOG_ERROR,
"chroma subsampling not supported in this colorspace\n");
return AVERROR(ENOSYS);
}
if ( f->avctx->bits_per_raw_sample <= 8 && !f->transparency)
f->pix_fmt = AV_PIX_FMT_0RGB32;
else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency)
f->pix_fmt = AV_PIX_FMT_RGB32;
else if (f->avctx->bits_per_raw_sample == 9 && !f->transparency)
f->pix_fmt = AV_PIX_FMT_GBRP9;
else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency)
f->pix_fmt = AV_PIX_FMT_GBRP10;
else if (f->avctx->bits_per_raw_sample == 10 && f->transparency)
f->pix_fmt = AV_PIX_FMT_GBRAP10;
else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency)
f->pix_fmt = AV_PIX_FMT_GBRP12;
else if (f->avctx->bits_per_raw_sample == 12 && f->transparency)
f->pix_fmt = AV_PIX_FMT_GBRAP12;
else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency)
f->pix_fmt = AV_PIX_FMT_GBRP14;
else if (f->avctx->bits_per_raw_sample == 14 && f->transparency)
f->pix_fmt = AV_PIX_FMT_GBRAP14;
else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency) {
if (f->flt) {
f->pix_fmt = AV_PIX_FMT_GBRPF16;
} else
f->pix_fmt = AV_PIX_FMT_GBRP16;
f->use32bit = 1;
} else if (f->avctx->bits_per_raw_sample == 16 && f->transparency) {
if (f->flt) {
f->pix_fmt = AV_PIX_FMT_GBRAPF16;
} else
f->pix_fmt = AV_PIX_FMT_GBRAP16;
f->use32bit = 1;
} else if (f->avctx->bits_per_raw_sample == 32 && !f->transparency) {
if (f->flt) {
f->pix_fmt = AV_PIX_FMT_GBRPF32;
}
f->use32bit = 1;
} else if (f->avctx->bits_per_raw_sample == 32 && f->transparency) {
if (f->flt) {
f->pix_fmt = AV_PIX_FMT_GBRAPF32;
}
f->use32bit = 1;
}
} else {
av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
return AVERROR(ENOSYS);
}
if (f->pix_fmt == AV_PIX_FMT_NONE) {
av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
return AVERROR(ENOSYS);
}
return 0;
}
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