// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Coda multi-standard codec IP - H.264 helper functions
*
* Copyright (C) 2012 Vista Silicon S.L.
* Javier Martin, <[email protected]>
* Xavier Duret
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/videodev2.h>
#include "coda.h"
static const u8 coda_filler_size[8] = { 0, 7, 14, 13, 12, 11, 10, 9 };
static const u8 *coda_find_nal_header(const u8 *buf, const u8 *end)
{
u32 val = 0xffffffff;
do {
val = val << 8 | *buf++;
if (buf >= end)
return NULL;
} while (val != 0x00000001);
return buf;
}
int coda_sps_parse_profile(struct coda_ctx *ctx, struct vb2_buffer *vb)
{
const u8 *buf = vb2_plane_vaddr(vb, 0);
const u8 *end = buf + vb2_get_plane_payload(vb, 0);
/* Find SPS header */
do {
buf = coda_find_nal_header(buf, end);
if (!buf)
return -EINVAL;
} while ((*buf++ & 0x1f) != 0x7);
ctx->params.h264_profile_idc = buf[0];
ctx->params.h264_level_idc = buf[2];
return 0;
}
int coda_h264_filler_nal(int size, char *p)
{
if (size < 6)
return -EINVAL;
p[0] = 0x00;
p[1] = 0x00;
p[2] = 0x00;
p[3] = 0x01;
p[4] = 0x0c;
memset(p + 5, 0xff, size - 6);
/* Add rbsp stop bit and trailing at the end */
p[size - 1] = 0x80;
return 0;
}
int coda_h264_padding(int size, char *p)
{
int nal_size;
int diff;
diff = size - (size & ~0x7);
if (diff == 0)
return 0;
nal_size = coda_filler_size[diff];
coda_h264_filler_nal(nal_size, p);
return nal_size;
}
int coda_h264_profile(int profile_idc)
{
switch (profile_idc) {
case 66: return V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE;
case 77: return V4L2_MPEG_VIDEO_H264_PROFILE_MAIN;
case 88: return V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED;
case 100: return V4L2_MPEG_VIDEO_H264_PROFILE_HIGH;
default: return -EINVAL;
}
}
int coda_h264_level(int level_idc)
{
switch (level_idc) {
case 10: return V4L2_MPEG_VIDEO_H264_LEVEL_1_0;
case 9: return V4L2_MPEG_VIDEO_H264_LEVEL_1B;
case 11: return V4L2_MPEG_VIDEO_H264_LEVEL_1_1;
case 12: return V4L2_MPEG_VIDEO_H264_LEVEL_1_2;
case 13: return V4L2_MPEG_VIDEO_H264_LEVEL_1_3;
case 20: return V4L2_MPEG_VIDEO_H264_LEVEL_2_0;
case 21: return V4L2_MPEG_VIDEO_H264_LEVEL_2_1;
case 22: return V4L2_MPEG_VIDEO_H264_LEVEL_2_2;
case 30: return V4L2_MPEG_VIDEO_H264_LEVEL_3_0;
case 31: return V4L2_MPEG_VIDEO_H264_LEVEL_3_1;
case 32: return V4L2_MPEG_VIDEO_H264_LEVEL_3_2;
case 40: return V4L2_MPEG_VIDEO_H264_LEVEL_4_0;
case 41: return V4L2_MPEG_VIDEO_H264_LEVEL_4_1;
case 42: return V4L2_MPEG_VIDEO_H264_LEVEL_4_2;
case 50: return V4L2_MPEG_VIDEO_H264_LEVEL_5_0;
case 51: return V4L2_MPEG_VIDEO_H264_LEVEL_5_1;
default: return -EINVAL;
}
}
struct rbsp {
char *buf;
int size;
int pos;
};
static inline int rbsp_read_bit(struct rbsp *rbsp)
{
int shift = 7 - (rbsp->pos % 8);
int ofs = rbsp->pos++ / 8;
if (ofs >= rbsp->size)
return -EINVAL;
return (rbsp->buf[ofs] >> shift) & 1;
}
static inline int rbsp_write_bit(struct rbsp *rbsp, int bit)
{
int shift = 7 - (rbsp->pos % 8);
int ofs = rbsp->pos++ / 8;
if (ofs >= rbsp->size)
return -EINVAL;
rbsp->buf[ofs] &= ~(1 << shift);
rbsp->buf[ofs] |= bit << shift;
return 0;
}
static inline int rbsp_read_bits(struct rbsp *rbsp, int num, int *val)
{
int i, ret;
int tmp = 0;
if (num > 32)
return -EINVAL;
for (i = 0; i < num; i++) {
ret = rbsp_read_bit(rbsp);
if (ret < 0)
return ret;
tmp |= ret << (num - i - 1);
}
if (val)
*val = tmp;
return 0;
}
static int rbsp_write_bits(struct rbsp *rbsp, int num, int value)
{
int ret;
while (num--) {
ret = rbsp_write_bit(rbsp, (value >> num) & 1);
if (ret)
return ret;
}
return 0;
}
static int rbsp_read_uev(struct rbsp *rbsp, unsigned int *val)
{
int leading_zero_bits = 0;
unsigned int tmp = 0;
int ret;
while ((ret = rbsp_read_bit(rbsp)) == 0)
leading_zero_bits++;
if (ret < 0)
return ret;
if (leading_zero_bits > 0) {
ret = rbsp_read_bits(rbsp, leading_zero_bits, &tmp);
if (ret)
return ret;
}
if (val)
*val = (1 << leading_zero_bits) - 1 + tmp;
return 0;
}
static int rbsp_write_uev(struct rbsp *rbsp, unsigned int value)
{
int i;
int ret;
int tmp = value + 1;
int leading_zero_bits = fls(tmp) - 1;
for (i = 0; i < leading_zero_bits; i++) {
ret = rbsp_write_bit(rbsp, 0);
if (ret)
return ret;
}
return rbsp_write_bits(rbsp, leading_zero_bits + 1, tmp);
}
static int rbsp_read_sev(struct rbsp *rbsp, int *val)
{
unsigned int tmp;
int ret;
ret = rbsp_read_uev(rbsp, &tmp);
if (ret)
return ret;
if (val) {
if (tmp & 1)
*val = (tmp + 1) / 2;
else
*val = -(tmp / 2);
}
return 0;
}
/**
* coda_h264_sps_fixup - fixes frame cropping values in h.264 SPS
* @ctx: encoder context
* @width: visible width
* @height: visible height
* @buf: buffer containing h.264 SPS RBSP, starting with NAL header
* @size: modified RBSP size return value
* @max_size: available size in buf
*
* Rewrites the frame cropping values in an h.264 SPS RBSP correctly for the
* given visible width and height.
*/
int coda_h264_sps_fixup(struct coda_ctx *ctx, int width, int height, char *buf,
int *size, int max_size)
{
int profile_idc;
unsigned int pic_order_cnt_type;
int pic_width_in_mbs_minus1, pic_height_in_map_units_minus1;
int frame_mbs_only_flag, frame_cropping_flag;
int vui_parameters_present_flag;
unsigned int crop_right, crop_bottom;
struct rbsp sps;
int pos;
int ret;
if (*size < 8 || *size >= max_size)
return -EINVAL;
sps.buf = buf + 5; /* Skip NAL header */
sps.size = *size - 5;
profile_idc = sps.buf[0];
/* Skip constraint_set[0-5]_flag, reserved_zero_2bits */
/* Skip level_idc */
sps.pos = 24;
/* seq_parameter_set_id */
ret = rbsp_read_uev(&sps, NULL);
if (ret)
return ret;
if (profile_idc == 100 || profile_idc == 110 || profile_idc == 122 ||
profile_idc == 244 || profile_idc == 44 || profile_idc == 83 ||
profile_idc == 86 || profile_idc == 118 || profile_idc == 128 ||
profile_idc == 138 || profile_idc == 139 || profile_idc == 134 ||
profile_idc == 135) {
dev_err(ctx->fh.vdev->dev_parent,
"%s: Handling profile_idc %d not implemented\n",
__func__, profile_idc);
return -EINVAL;
}
/* log2_max_frame_num_minus4 */
ret = rbsp_read_uev(&sps, NULL);
if (ret)
return ret;
ret = rbsp_read_uev(&sps, &pic_order_cnt_type);
if (ret)
return ret;
if (pic_order_cnt_type == 0) {
/* log2_max_pic_order_cnt_lsb_minus4 */
ret = rbsp_read_uev(&sps, NULL);
if (ret)
return ret;
} else if (pic_order_cnt_type == 1) {
unsigned int i, num_ref_frames_in_pic_order_cnt_cycle;
/* delta_pic_order_always_zero_flag */
ret = rbsp_read_bit(&sps);
if (ret < 0)
return ret;
/* offset_for_non_ref_pic */
ret = rbsp_read_sev(&sps, NULL);
if (ret)
return ret;
/* offset_for_top_to_bottom_field */
ret = rbsp_read_sev(&sps, NULL);
if (ret)
return ret;
ret = rbsp_read_uev(&sps,
&num_ref_frames_in_pic_order_cnt_cycle);
if (ret)
return ret;
for (i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++) {
/* offset_for_ref_frame */
ret = rbsp_read_sev(&sps, NULL);
if (ret)
return ret;
}
}
/* max_num_ref_frames */
ret = rbsp_read_uev(&sps, NULL);
if (ret)
return ret;
/* gaps_in_frame_num_value_allowed_flag */
ret = rbsp_read_bit(&sps);
if (ret < 0)
return ret;
ret = rbsp_read_uev(&sps, &pic_width_in_mbs_minus1);
if (ret)
return ret;
ret = rbsp_read_uev(&sps, &pic_height_in_map_units_minus1);
if (ret)
return ret;
frame_mbs_only_flag = ret = rbsp_read_bit(&sps);
if (ret < 0)
return ret;
if (!frame_mbs_only_flag) {
/* mb_adaptive_frame_field_flag */
ret = rbsp_read_bit(&sps);
if (ret < 0)
return ret;
}
/* direct_8x8_inference_flag */
ret = rbsp_read_bit(&sps);
if (ret < 0)
return ret;
/* Mark position of the frame cropping flag */
pos = sps.pos;
frame_cropping_flag = ret = rbsp_read_bit(&sps);
if (ret < 0)
return ret;
if (frame_cropping_flag) {
unsigned int crop_left, crop_top;
ret = rbsp_read_uev(&sps, &crop_left);
if (ret)
return ret;
ret = rbsp_read_uev(&sps, &crop_right);
if (ret)
return ret;
ret = rbsp_read_uev(&sps, &crop_top);
if (ret)
return ret;
ret = rbsp_read_uev(&sps, &crop_bottom);
if (ret)
return ret;
}
vui_parameters_present_flag = ret = rbsp_read_bit(&sps);
if (ret < 0)
return ret;
if (vui_parameters_present_flag) {
dev_err(ctx->fh.vdev->dev_parent,
"%s: Handling vui_parameters not implemented\n",
__func__);
return -EINVAL;
}
crop_right = round_up(width, 16) - width;
crop_bottom = round_up(height, 16) - height;
crop_right /= 2;
if (frame_mbs_only_flag)
crop_bottom /= 2;
else
crop_bottom /= 4;
sps.size = max_size - 5;
sps.pos = pos;
frame_cropping_flag = 1;
ret = rbsp_write_bit(&sps, frame_cropping_flag);
if (ret)
return ret;
ret = rbsp_write_uev(&sps, 0); /* crop_left */
if (ret)
return ret;
ret = rbsp_write_uev(&sps, crop_right);
if (ret)
return ret;
ret = rbsp_write_uev(&sps, 0); /* crop_top */
if (ret)
return ret;
ret = rbsp_write_uev(&sps, crop_bottom);
if (ret)
return ret;
ret = rbsp_write_bit(&sps, 0); /* vui_parameters_present_flag */
if (ret)
return ret;
ret = rbsp_write_bit(&sps, 1);
if (ret)
return ret;
*size = 5 + DIV_ROUND_UP(sps.pos, 8);
return 0;
}
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