diff options
Diffstat (limited to 'drivers/staging/media/allegro-dvt/nal-h264.c')
| -rw-r--r-- | drivers/staging/media/allegro-dvt/nal-h264.c | 1001 |
1 files changed, 1001 insertions, 0 deletions
diff --git a/drivers/staging/media/allegro-dvt/nal-h264.c b/drivers/staging/media/allegro-dvt/nal-h264.c new file mode 100644 index 000000000000..4e14b77851e1 --- /dev/null +++ b/drivers/staging/media/allegro-dvt/nal-h264.c @@ -0,0 +1,1001 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Pengutronix, Michael Tretter <kernel@pengutronix.de> + * + * Convert NAL units between raw byte sequence payloads (RBSP) and C structs + * + * The conversion is defined in "ITU-T Rec. H.264 (04/2017) Advanced video + * coding for generic audiovisual services". Decoder drivers may use the + * parser to parse RBSP from encoded streams and configure the hardware, if + * the hardware is not able to parse RBSP itself. Encoder drivers may use the + * generator to generate the RBSP for SPS/PPS nal units and add them to the + * encoded stream if the hardware does not generate the units. + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/v4l2-controls.h> + +#include <linux/device.h> +#include <linux/export.h> +#include <linux/log2.h> + +#include "nal-h264.h" + +/* + * See Rec. ITU-T H.264 (04/2017) Table 7-1 – NAL unit type codes, syntax + * element categories, and NAL unit type classes + */ +enum nal_unit_type { + SEQUENCE_PARAMETER_SET = 7, + PICTURE_PARAMETER_SET = 8, + FILLER_DATA = 12, +}; + +struct rbsp; + +struct nal_h264_ops { + int (*rbsp_bit)(struct rbsp *rbsp, int *val); + int (*rbsp_bits)(struct rbsp *rbsp, int n, unsigned int *val); + int (*rbsp_uev)(struct rbsp *rbsp, unsigned int *val); + int (*rbsp_sev)(struct rbsp *rbsp, int *val); +}; + +/** + * struct rbsp - State object for handling a raw byte sequence payload + * @data: pointer to the data of the rbsp + * @size: maximum size of the data of the rbsp + * @pos: current bit position inside the rbsp + * @num_consecutive_zeros: number of zeros before @pos + * @ops: per datatype functions for interacting with the rbsp + * @error: an error occurred while handling the rbsp + * + * This struct is passed around the various parsing functions and tracks the + * current position within the raw byte sequence payload. + * + * The @ops field allows to separate the operation, i.e., reading/writing a + * value from/to that rbsp, from the structure of the NAL unit. This allows to + * have a single function for iterating the NAL unit, while @ops has function + * pointers for handling each type in the rbsp. + */ +struct rbsp { + u8 *data; + size_t size; + unsigned int pos; + unsigned int num_consecutive_zeros; + struct nal_h264_ops *ops; + int error; +}; + +static void rbsp_init(struct rbsp *rbsp, void *addr, size_t size, + struct nal_h264_ops *ops) +{ + if (!rbsp) + return; + + rbsp->data = addr; + rbsp->size = size; + rbsp->pos = 0; + rbsp->ops = ops; + rbsp->error = 0; +} + +/** + * nal_h264_profile_from_v4l2() - Get profile_idc for v4l2 h264 profile + * @profile: the profile as &enum v4l2_mpeg_video_h264_profile + * + * Convert the &enum v4l2_mpeg_video_h264_profile to profile_idc as specified + * in Rec. ITU-T H.264 (04/2017) A.2. + * + * Return: the profile_idc for the passed level + */ +int nal_h264_profile_from_v4l2(enum v4l2_mpeg_video_h264_profile profile) +{ + switch (profile) { + case V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE: + return 66; + case V4L2_MPEG_VIDEO_H264_PROFILE_MAIN: + return 77; + case V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED: + return 88; + case V4L2_MPEG_VIDEO_H264_PROFILE_HIGH: + return 100; + default: + return -EINVAL; + } +} + +/** + * nal_h264_level_from_v4l2() - Get level_idc for v4l2 h264 level + * @level: the level as &enum v4l2_mpeg_video_h264_level + * + * Convert the &enum v4l2_mpeg_video_h264_level to level_idc as specified in + * Rec. ITU-T H.264 (04/2017) A.3.2. + * + * Return: the level_idc for the passed level + */ +int nal_h264_level_from_v4l2(enum v4l2_mpeg_video_h264_level level) +{ + switch (level) { + case V4L2_MPEG_VIDEO_H264_LEVEL_1_0: + return 10; + case V4L2_MPEG_VIDEO_H264_LEVEL_1B: + return 9; + case V4L2_MPEG_VIDEO_H264_LEVEL_1_1: + return 11; + case V4L2_MPEG_VIDEO_H264_LEVEL_1_2: + return 12; + case V4L2_MPEG_VIDEO_H264_LEVEL_1_3: + return 13; + case V4L2_MPEG_VIDEO_H264_LEVEL_2_0: + return 20; + case V4L2_MPEG_VIDEO_H264_LEVEL_2_1: + return 21; + case V4L2_MPEG_VIDEO_H264_LEVEL_2_2: + return 22; + case V4L2_MPEG_VIDEO_H264_LEVEL_3_0: + return 30; + case V4L2_MPEG_VIDEO_H264_LEVEL_3_1: + return 31; + case V4L2_MPEG_VIDEO_H264_LEVEL_3_2: + return 32; + case V4L2_MPEG_VIDEO_H264_LEVEL_4_0: + return 40; + case V4L2_MPEG_VIDEO_H264_LEVEL_4_1: + return 41; + case V4L2_MPEG_VIDEO_H264_LEVEL_4_2: + return 42; + case V4L2_MPEG_VIDEO_H264_LEVEL_5_0: + return 50; + case V4L2_MPEG_VIDEO_H264_LEVEL_5_1: + return 51; + default: + return -EINVAL; + } +} + +static int rbsp_read_bits(struct rbsp *rbsp, int n, unsigned int *value); +static int rbsp_write_bits(struct rbsp *rbsp, int n, unsigned int value); + +/* + * When reading or writing, the emulation_prevention_three_byte is detected + * only when the 2 one bits need to be inserted. Therefore, we are not + * actually adding the 0x3 byte, but the 2 one bits and the six 0 bits of the + * next byte. + */ +#define EMULATION_PREVENTION_THREE_BYTE (0x3 << 6) + +static int add_emulation_prevention_three_byte(struct rbsp *rbsp) +{ + rbsp->num_consecutive_zeros = 0; + rbsp_write_bits(rbsp, 8, EMULATION_PREVENTION_THREE_BYTE); + + return 0; +} + +static int discard_emulation_prevention_three_byte(struct rbsp *rbsp) +{ + unsigned int tmp = 0; + + rbsp->num_consecutive_zeros = 0; + rbsp_read_bits(rbsp, 8, &tmp); + if (tmp != EMULATION_PREVENTION_THREE_BYTE) + return -EINVAL; + + return 0; +} + +static inline int rbsp_read_bit(struct rbsp *rbsp) +{ + int shift; + int ofs; + int bit; + int err; + + if (rbsp->num_consecutive_zeros == 22) { + err = discard_emulation_prevention_three_byte(rbsp); + if (err) + return err; + } + + shift = 7 - (rbsp->pos % 8); + ofs = rbsp->pos / 8; + if (ofs >= rbsp->size) + return -EINVAL; + + bit = (rbsp->data[ofs] >> shift) & 1; + + rbsp->pos++; + + if (bit == 1 || + (rbsp->num_consecutive_zeros < 7 && (rbsp->pos % 8 == 0))) + rbsp->num_consecutive_zeros = 0; + else + rbsp->num_consecutive_zeros++; + + return bit; +} + +static inline int rbsp_write_bit(struct rbsp *rbsp, bool value) +{ + int shift; + int ofs; + + if (rbsp->num_consecutive_zeros == 22) + add_emulation_prevention_three_byte(rbsp); + + shift = 7 - (rbsp->pos % 8); + ofs = rbsp->pos / 8; + if (ofs >= rbsp->size) + return -EINVAL; + + rbsp->data[ofs] &= ~(1 << shift); + rbsp->data[ofs] |= value << shift; + + rbsp->pos++; + + if (value == 1 || + (rbsp->num_consecutive_zeros < 7 && (rbsp->pos % 8 == 0))) { + rbsp->num_consecutive_zeros = 0; + } else { + rbsp->num_consecutive_zeros++; + } + + return 0; +} + +static inline int rbsp_read_bits(struct rbsp *rbsp, int n, unsigned int *value) +{ + int i; + int bit; + unsigned int tmp = 0; + + if (n > 8 * sizeof(*value)) + return -EINVAL; + + for (i = n; i > 0; i--) { + bit = rbsp_read_bit(rbsp); + if (bit < 0) + return bit; + tmp |= bit << (i - 1); + } + + if (value) + *value = tmp; + + return 0; +} + +static int rbsp_write_bits(struct rbsp *rbsp, int n, unsigned int value) +{ + int ret; + + if (n > 8 * sizeof(value)) + return -EINVAL; + + while (n--) { + ret = rbsp_write_bit(rbsp, (value >> n) & 1); + if (ret) + return ret; + } + + return 0; +} + +static int rbsp_read_uev(struct rbsp *rbsp, unsigned int *value) +{ + 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 (value) + *value = (1 << leading_zero_bits) - 1 + tmp; + + return 0; +} + +static int rbsp_write_uev(struct rbsp *rbsp, unsigned int *value) +{ + int ret; + int leading_zero_bits; + + if (!value) + return -EINVAL; + + leading_zero_bits = ilog2(*value + 1); + + ret = rbsp_write_bits(rbsp, leading_zero_bits, 0); + if (ret) + return ret; + + return rbsp_write_bits(rbsp, leading_zero_bits + 1, *value + 1); +} + +static int rbsp_read_sev(struct rbsp *rbsp, int *value) +{ + int ret; + unsigned int tmp; + + ret = rbsp_read_uev(rbsp, &tmp); + if (ret) + return ret; + + if (value) { + if (tmp & 1) + *value = (tmp + 1) / 2; + else + *value = -(tmp / 2); + } + + return 0; +} + +static int rbsp_write_sev(struct rbsp *rbsp, int *value) +{ + unsigned int tmp; + + if (!value) + return -EINVAL; + + if (*value > 0) + tmp = (2 * (*value)) | 1; + else + tmp = -2 * (*value); + + return rbsp_write_uev(rbsp, &tmp); +} + +static int __rbsp_write_bit(struct rbsp *rbsp, int *value) +{ + return rbsp_write_bit(rbsp, *value); +} + +static int __rbsp_write_bits(struct rbsp *rbsp, int n, unsigned int *value) +{ + return rbsp_write_bits(rbsp, n, *value); +} + +static struct nal_h264_ops write = { + .rbsp_bit = __rbsp_write_bit, + .rbsp_bits = __rbsp_write_bits, + .rbsp_uev = rbsp_write_uev, + .rbsp_sev = rbsp_write_sev, +}; + +static int __rbsp_read_bit(struct rbsp *rbsp, int *value) +{ + int tmp = rbsp_read_bit(rbsp); + + if (tmp < 0) + return tmp; + *value = tmp; + + return 0; +} + +static struct nal_h264_ops read = { + .rbsp_bit = __rbsp_read_bit, + .rbsp_bits = rbsp_read_bits, + .rbsp_uev = rbsp_read_uev, + .rbsp_sev = rbsp_read_sev, +}; + +static inline void rbsp_bit(struct rbsp *rbsp, int *value) +{ + if (rbsp->error) + return; + rbsp->error = rbsp->ops->rbsp_bit(rbsp, value); +} + +static inline void rbsp_bits(struct rbsp *rbsp, int n, int *value) +{ + if (rbsp->error) + return; + rbsp->error = rbsp->ops->rbsp_bits(rbsp, n, value); +} + +static inline void rbsp_uev(struct rbsp *rbsp, unsigned int *value) +{ + if (rbsp->error) + return; + rbsp->error = rbsp->ops->rbsp_uev(rbsp, value); +} + +static inline void rbsp_sev(struct rbsp *rbsp, int *value) +{ + if (rbsp->error) + return; + rbsp->error = rbsp->ops->rbsp_sev(rbsp, value); +} + +static void nal_h264_rbsp_trailing_bits(struct rbsp *rbsp) +{ + unsigned int rbsp_stop_one_bit = 1; + unsigned int rbsp_alignment_zero_bit = 0; + + rbsp_bit(rbsp, &rbsp_stop_one_bit); + rbsp_bits(rbsp, round_up(rbsp->pos, 8) - rbsp->pos, + &rbsp_alignment_zero_bit); +} + +static void nal_h264_write_start_code_prefix(struct rbsp *rbsp) +{ + u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); + int i = 4; + + if (DIV_ROUND_UP(rbsp->pos, 8) + i > rbsp->size) { + rbsp->error = -EINVAL; + return; + } + + p[0] = 0x00; + p[1] = 0x00; + p[2] = 0x00; + p[3] = 0x01; + + rbsp->pos += i * 8; +} + +static void nal_h264_read_start_code_prefix(struct rbsp *rbsp) +{ + u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); + int i = 4; + + if (DIV_ROUND_UP(rbsp->pos, 8) + i > rbsp->size) { + rbsp->error = -EINVAL; + return; + } + + if (p[0] != 0x00 || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0x01) { + rbsp->error = -EINVAL; + return; + } + + rbsp->pos += i * 8; +} + +static void nal_h264_write_filler_data(struct rbsp *rbsp) +{ + u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); + int i; + + /* Keep 1 byte extra for terminating the NAL unit */ + i = rbsp->size - DIV_ROUND_UP(rbsp->pos, 8) - 1; + memset(p, 0xff, i); + rbsp->pos += i * 8; +} + +static void nal_h264_read_filler_data(struct rbsp *rbsp) +{ + u8 *p = rbsp->data + DIV_ROUND_UP(rbsp->pos, 8); + + while (*p == 0xff) { + if (DIV_ROUND_UP(rbsp->pos, 8) > rbsp->size) { + rbsp->error = -EINVAL; + return; + } + + p++; + rbsp->pos += 8; + } +} + +static void nal_h264_rbsp_hrd_parameters(struct rbsp *rbsp, + struct nal_h264_hrd_parameters *hrd) +{ + unsigned int i; + + if (!hrd) { + rbsp->error = -EINVAL; + return; + } + + rbsp_uev(rbsp, &hrd->cpb_cnt_minus1); + rbsp_bits(rbsp, 4, &hrd->bit_rate_scale); + rbsp_bits(rbsp, 4, &hrd->cpb_size_scale); + + for (i = 0; i <= hrd->cpb_cnt_minus1; i++) { + rbsp_uev(rbsp, &hrd->bit_rate_value_minus1[i]); + rbsp_uev(rbsp, &hrd->cpb_size_value_minus1[i]); + rbsp_bit(rbsp, &hrd->cbr_flag[i]); + } + + rbsp_bits(rbsp, 5, &hrd->initial_cpb_removal_delay_length_minus1); + rbsp_bits(rbsp, 5, &hrd->cpb_removal_delay_length_minus1); + rbsp_bits(rbsp, 5, &hrd->dpb_output_delay_length_minus1); + rbsp_bits(rbsp, 5, &hrd->time_offset_length); +} + +static void nal_h264_rbsp_vui_parameters(struct rbsp *rbsp, + struct nal_h264_vui_parameters *vui) +{ + if (!vui) { + rbsp->error = -EINVAL; + return; + } + + rbsp_bit(rbsp, &vui->aspect_ratio_info_present_flag); + if (vui->aspect_ratio_info_present_flag) { + rbsp_bits(rbsp, 8, &vui->aspect_ratio_idc); + if (vui->aspect_ratio_idc == 255) { + rbsp_bits(rbsp, 16, &vui->sar_width); + rbsp_bits(rbsp, 16, &vui->sar_height); + } + } + + rbsp_bit(rbsp, &vui->overscan_info_present_flag); + if (vui->overscan_info_present_flag) + rbsp_bit(rbsp, &vui->overscan_appropriate_flag); + + rbsp_bit(rbsp, &vui->video_signal_type_present_flag); + if (vui->video_signal_type_present_flag) { + rbsp_bits(rbsp, 3, &vui->video_format); + rbsp_bit(rbsp, &vui->video_full_range_flag); + + rbsp_bit(rbsp, &vui->colour_description_present_flag); + if (vui->colour_description_present_flag) { + rbsp_bits(rbsp, 8, &vui->colour_primaries); + rbsp_bits(rbsp, 8, &vui->transfer_characteristics); + rbsp_bits(rbsp, 8, &vui->matrix_coefficients); + } + } + + rbsp_bit(rbsp, &vui->chroma_loc_info_present_flag); + if (vui->chroma_loc_info_present_flag) { + rbsp_uev(rbsp, &vui->chroma_sample_loc_type_top_field); + rbsp_uev(rbsp, &vui->chroma_sample_loc_type_bottom_field); + } + + rbsp_bit(rbsp, &vui->timing_info_present_flag); + if (vui->timing_info_present_flag) { + rbsp_bits(rbsp, 32, &vui->num_units_in_tick); + rbsp_bits(rbsp, 32, &vui->time_scale); + rbsp_bit(rbsp, &vui->fixed_frame_rate_flag); + } + + rbsp_bit(rbsp, &vui->nal_hrd_parameters_present_flag); + if (vui->nal_hrd_parameters_present_flag) + nal_h264_rbsp_hrd_parameters(rbsp, &vui->nal_hrd_parameters); + + rbsp_bit(rbsp, &vui->vcl_hrd_parameters_present_flag); + if (vui->vcl_hrd_parameters_present_flag) + nal_h264_rbsp_hrd_parameters(rbsp, &vui->vcl_hrd_parameters); + + if (vui->nal_hrd_parameters_present_flag || + vui->vcl_hrd_parameters_present_flag) + rbsp_bit(rbsp, &vui->low_delay_hrd_flag); + + rbsp_bit(rbsp, &vui->pic_struct_present_flag); + + rbsp_bit(rbsp, &vui->bitstream_restriction_flag); + if (vui->bitstream_restriction_flag) { + rbsp_bit(rbsp, &vui->motion_vectors_over_pic_boundaries_flag); + rbsp_uev(rbsp, &vui->max_bytes_per_pic_denom); + rbsp_uev(rbsp, &vui->max_bits_per_mb_denom); + rbsp_uev(rbsp, &vui->log2_max_mv_length_horizontal); + rbsp_uev(rbsp, &vui->log21_max_mv_length_vertical); + rbsp_uev(rbsp, &vui->max_num_reorder_frames); + rbsp_uev(rbsp, &vui->max_dec_frame_buffering); + } +} + +static void nal_h264_rbsp_sps(struct rbsp *rbsp, struct nal_h264_sps *sps) +{ + unsigned int i; + + if (!sps) { + rbsp->error = -EINVAL; + return; + } + + rbsp_bits(rbsp, 8, &sps->profile_idc); + rbsp_bit(rbsp, &sps->constraint_set0_flag); + rbsp_bit(rbsp, &sps->constraint_set1_flag); + rbsp_bit(rbsp, &sps->constraint_set2_flag); + rbsp_bit(rbsp, &sps->constraint_set3_flag); + rbsp_bit(rbsp, &sps->constraint_set4_flag); + rbsp_bit(rbsp, &sps->constraint_set5_flag); + rbsp_bits(rbsp, 2, &sps->reserved_zero_2bits); + rbsp_bits(rbsp, 8, &sps->level_idc); + + rbsp_uev(rbsp, &sps->seq_parameter_set_id); + + if (sps->profile_idc == 100 || sps->profile_idc == 110 || + sps->profile_idc == 122 || sps->profile_idc == 244 || + sps->profile_idc == 44 || sps->profile_idc == 83 || + sps->profile_idc == 86 || sps->profile_idc == 118 || + sps->profile_idc == 128 || sps->profile_idc == 138 || + sps->profile_idc == 139 || sps->profile_idc == 134 || + sps->profile_idc == 135) { + rbsp_uev(rbsp, &sps->chroma_format_idc); + + if (sps->chroma_format_idc == 3) + rbsp_bit(rbsp, &sps->separate_colour_plane_flag); + rbsp_uev(rbsp, &sps->bit_depth_luma_minus8); + rbsp_uev(rbsp, &sps->bit_depth_chroma_minus8); + rbsp_bit(rbsp, &sps->qpprime_y_zero_transform_bypass_flag); + rbsp_bit(rbsp, &sps->seq_scaling_matrix_present_flag); + if (sps->seq_scaling_matrix_present_flag) + rbsp->error = -EINVAL; + } + + rbsp_uev(rbsp, &sps->log2_max_frame_num_minus4); + + rbsp_uev(rbsp, &sps->pic_order_cnt_type); + switch (sps->pic_order_cnt_type) { + case 0: + rbsp_uev(rbsp, &sps->log2_max_pic_order_cnt_lsb_minus4); + break; + case 1: + rbsp_bit(rbsp, &sps->delta_pic_order_always_zero_flag); + rbsp_sev(rbsp, &sps->offset_for_non_ref_pic); + rbsp_sev(rbsp, &sps->offset_for_top_to_bottom_field); + + rbsp_uev(rbsp, &sps->num_ref_frames_in_pic_order_cnt_cycle); + for (i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++) + rbsp_sev(rbsp, &sps->offset_for_ref_frame[i]); + break; + default: + rbsp->error = -EINVAL; + break; + } + + rbsp_uev(rbsp, &sps->max_num_ref_frames); + rbsp_bit(rbsp, &sps->gaps_in_frame_num_value_allowed_flag); + rbsp_uev(rbsp, &sps->pic_width_in_mbs_minus1); + rbsp_uev(rbsp, &sps->pic_height_in_map_units_minus1); + + rbsp_bit(rbsp, &sps->frame_mbs_only_flag); + if (!sps->frame_mbs_only_flag) + rbsp_bit(rbsp, &sps->mb_adaptive_frame_field_flag); + + rbsp_bit(rbsp, &sps->direct_8x8_inference_flag); + + rbsp_bit(rbsp, &sps->frame_cropping_flag); + if (sps->frame_cropping_flag) { + rbsp_uev(rbsp, &sps->crop_left); + rbsp_uev(rbsp, &sps->crop_right); + rbsp_uev(rbsp, &sps->crop_top); + rbsp_uev(rbsp, &sps->crop_bottom); + } + + rbsp_bit(rbsp, &sps->vui_parameters_present_flag); + if (sps->vui_parameters_present_flag) + nal_h264_rbsp_vui_parameters(rbsp, &sps->vui); +} + +static void nal_h264_rbsp_pps(struct rbsp *rbsp, struct nal_h264_pps *pps) +{ + int i; + + rbsp_uev(rbsp, &pps->pic_parameter_set_id); + rbsp_uev(rbsp, &pps->seq_parameter_set_id); + rbsp_bit(rbsp, &pps->entropy_coding_mode_flag); + rbsp_bit(rbsp, &pps->bottom_field_pic_order_in_frame_present_flag); + rbsp_uev(rbsp, &pps->num_slice_groups_minus1); + if (pps->num_slice_groups_minus1 > 0) { + rbsp_uev(rbsp, &pps->slice_group_map_type); + switch (pps->slice_group_map_type) { + case 0: + for (i = 0; i < pps->num_slice_groups_minus1; i++) + rbsp_uev(rbsp, &pps->run_length_minus1[i]); + break; + case 2: + for (i = 0; i < pps->num_slice_groups_minus1; i++) { + rbsp_uev(rbsp, &pps->top_left[i]); + rbsp_uev(rbsp, &pps->bottom_right[i]); + } + break; + case 3: case 4: case 5: + rbsp_bit(rbsp, &pps->slice_group_change_direction_flag); + rbsp_uev(rbsp, &pps->slice_group_change_rate_minus1); + break; + case 6: + rbsp_uev(rbsp, &pps->pic_size_in_map_units_minus1); + for (i = 0; i < pps->pic_size_in_map_units_minus1; i++) + rbsp_bits(rbsp, + order_base_2(pps->num_slice_groups_minus1 + 1), + &pps->slice_group_id[i]); + break; + default: + break; + } + } + rbsp_uev(rbsp, &pps->num_ref_idx_l0_default_active_minus1); + rbsp_uev(rbsp, &pps->num_ref_idx_l1_default_active_minus1); + rbsp_bit(rbsp, &pps->weighted_pred_flag); + rbsp_bits(rbsp, 2, &pps->weighted_bipred_idc); + rbsp_sev(rbsp, &pps->pic_init_qp_minus26); + rbsp_sev(rbsp, &pps->pic_init_qs_minus26); + rbsp_sev(rbsp, &pps->chroma_qp_index_offset); + rbsp_bit(rbsp, &pps->deblocking_filter_control_present_flag); + rbsp_bit(rbsp, &pps->constrained_intra_pred_flag); + rbsp_bit(rbsp, &pps->redundant_pic_cnt_present_flag); + if (/* more_rbsp_data() */ false) { + rbsp_bit(rbsp, &pps->transform_8x8_mode_flag); + rbsp_bit(rbsp, &pps->pic_scaling_matrix_present_flag); + if (pps->pic_scaling_matrix_present_flag) + rbsp->error = -EINVAL; + rbsp_sev(rbsp, &pps->second_chroma_qp_index_offset); + } +} + +/** + * nal_h264_write_sps() - Write SPS NAL unit into RBSP format + * @dev: device pointer + * @dest: the buffer that is filled with RBSP data + * @n: maximum size of @dest in bytes + * @sps: &struct nal_h264_sps to convert to RBSP + * + * Convert @sps to RBSP data and write it into @dest. + * + * The size of the SPS NAL unit is not known in advance and this function will + * fail, if @dest does not hold sufficient space for the SPS NAL unit. + * + * Return: number of bytes written to @dest or negative error code + */ +ssize_t nal_h264_write_sps(const struct device *dev, + void *dest, size_t n, struct nal_h264_sps *sps) +{ + struct rbsp rbsp; + unsigned int forbidden_zero_bit = 0; + unsigned int nal_ref_idc = 0; + unsigned int nal_unit_type = SEQUENCE_PARAMETER_SET; + + if (!dest) + return -EINVAL; + + rbsp_init(&rbsp, dest, n, &write); + + nal_h264_write_start_code_prefix(&rbsp); + + rbsp_bit(&rbsp, &forbidden_zero_bit); + rbsp_bits(&rbsp, 2, &nal_ref_idc); + rbsp_bits(&rbsp, 5, &nal_unit_type); + + nal_h264_rbsp_sps(&rbsp, sps); + + nal_h264_rbsp_trailing_bits(&rbsp); + + if (rbsp.error) + return rbsp.error; + + return DIV_ROUND_UP(rbsp.pos, 8); +} +EXPORT_SYMBOL_GPL(nal_h264_write_sps); + +/** + * nal_h264_read_sps() - Read SPS NAL unit from RBSP format + * @dev: device pointer + * @sps: the &struct nal_h264_sps to fill from the RBSP data + * @src: the buffer that contains the RBSP data + * @n: size of @src in bytes + * + * Read RBSP data from @src and use it to fill @sps. + * + * Return: number of bytes read from @src or negative error code + */ +ssize_t nal_h264_read_sps(const struct device *dev, + struct nal_h264_sps *sps, void *src, size_t n) +{ + struct rbsp rbsp; + unsigned int forbidden_zero_bit; + unsigned int nal_ref_idc; + unsigned int nal_unit_type; + + if (!src) + return -EINVAL; + + rbsp_init(&rbsp, src, n, &read); + + nal_h264_read_start_code_prefix(&rbsp); + + rbsp_bit(&rbsp, &forbidden_zero_bit); + rbsp_bits(&rbsp, 2, &nal_ref_idc); + rbsp_bits(&rbsp, 5, &nal_unit_type); + + if (rbsp.error || + forbidden_zero_bit != 0 || + nal_ref_idc != 0 || + nal_unit_type != SEQUENCE_PARAMETER_SET) + return -EINVAL; + + nal_h264_rbsp_sps(&rbsp, sps); + + nal_h264_rbsp_trailing_bits(&rbsp); + + if (rbsp.error) + return rbsp.error; + + return DIV_ROUND_UP(rbsp.pos, 8); +} +EXPORT_SYMBOL_GPL(nal_h264_read_sps); + +/** + * nal_h264_write_pps() - Write PPS NAL unit into RBSP format + * @dev: device pointer + * @dest: the buffer that is filled with RBSP data + * @n: maximum size of @dest in bytes + * @pps: &struct nal_h264_pps to convert to RBSP + * + * Convert @pps to RBSP data and write it into @dest. + * + * The size of the PPS NAL unit is not known in advance and this function will + * fail, if @dest does not hold sufficient space for the PPS NAL unit. + * + * Return: number of bytes written to @dest or negative error code + */ +ssize_t nal_h264_write_pps(const struct device *dev, + void *dest, size_t n, struct nal_h264_pps *pps) +{ + struct rbsp rbsp; + unsigned int forbidden_zero_bit = 0; + unsigned int nal_ref_idc = 0; + unsigned int nal_unit_type = PICTURE_PARAMETER_SET; + + if (!dest) + return -EINVAL; + + rbsp_init(&rbsp, dest, n, &write); + + nal_h264_write_start_code_prefix(&rbsp); + + /* NAL unit header */ + rbsp_bit(&rbsp, &forbidden_zero_bit); + rbsp_bits(&rbsp, 2, &nal_ref_idc); + rbsp_bits(&rbsp, 5, &nal_unit_type); + + nal_h264_rbsp_pps(&rbsp, pps); + + nal_h264_rbsp_trailing_bits(&rbsp); + + if (rbsp.error) + return rbsp.error; + + return DIV_ROUND_UP(rbsp.pos, 8); +} +EXPORT_SYMBOL_GPL(nal_h264_write_pps); + +/** + * nal_h264_read_pps() - Read PPS NAL unit from RBSP format + * @dev: device pointer + * @pps: the &struct nal_h264_pps to fill from the RBSP data + * @src: the buffer that contains the RBSP data + * @n: size of @src in bytes + * + * Read RBSP data from @src and use it to fill @pps. + * + * Return: number of bytes read from @src or negative error code + */ +ssize_t nal_h264_read_pps(const struct device *dev, + struct nal_h264_pps *pps, void *src, size_t n) +{ + struct rbsp rbsp; + + if (!src) + return -EINVAL; + + rbsp_init(&rbsp, src, n, &read); + + nal_h264_read_start_code_prefix(&rbsp); + + /* NAL unit header */ + rbsp.pos += 8; + + nal_h264_rbsp_pps(&rbsp, pps); + + nal_h264_rbsp_trailing_bits(&rbsp); + + if (rbsp.error) + return rbsp.error; + + return DIV_ROUND_UP(rbsp.pos, 8); +} +EXPORT_SYMBOL_GPL(nal_h264_read_pps); + +/** + * nal_h264_write_filler() - Write filler data RBSP + * @dev: device pointer + * @dest: buffer to fill with filler data + * @n: size of the buffer to fill with filler data + * + * Write a filler data RBSP to @dest with a size of @n bytes and return the + * number of written filler data bytes. + * + * Use this function to generate dummy data in an RBSP data stream that can be + * safely ignored by h264 decoders. + * + * The RBSP format of the filler data is specified in Rec. ITU-T H.264 + * (04/2017) 7.3.2.7 Filler data RBSP syntax. + * + * Return: number of filler data bytes (including marker) or negative error + */ +ssize_t nal_h264_write_filler(const struct device *dev, void *dest, size_t n) +{ + struct rbsp rbsp; + unsigned int forbidden_zero_bit = 0; + unsigned int nal_ref_idc = 0; + unsigned int nal_unit_type = FILLER_DATA; + + if (!dest) + return -EINVAL; + + rbsp_init(&rbsp, dest, n, &write); + + nal_h264_write_start_code_prefix(&rbsp); + + rbsp_bit(&rbsp, &forbidden_zero_bit); + rbsp_bits(&rbsp, 2, &nal_ref_idc); + rbsp_bits(&rbsp, 5, &nal_unit_type); + + nal_h264_write_filler_data(&rbsp); + + nal_h264_rbsp_trailing_bits(&rbsp); + + return DIV_ROUND_UP(rbsp.pos, 8); +} +EXPORT_SYMBOL_GPL(nal_h264_write_filler); + +/** + * nal_h264_read_filler() - Read filler data RBSP + * @dev: device pointer + * @src: buffer with RBSP data that is read + * @n: maximum size of src that shall be read + * + * Read a filler data RBSP from @src up to a maximum size of @n bytes and + * return the size of the filler data in bytes including the marker. + * + * This function is used to parse filler data and skip the respective bytes in + * the RBSP data. + * + * The RBSP format of the filler data is specified in Rec. ITU-T H.264 + * (04/2017) 7.3.2.7 Filler data RBSP syntax. + * + * Return: number of filler data bytes (including marker) or negative error + */ +ssize_t nal_h264_read_filler(const struct device *dev, void *src, size_t n) +{ + struct rbsp rbsp; + unsigned int forbidden_zero_bit; + unsigned int nal_ref_idc; + unsigned int nal_unit_type; + + if (!src) + return -EINVAL; + + rbsp_init(&rbsp, src, n, &read); + + nal_h264_read_start_code_prefix(&rbsp); + + rbsp_bit(&rbsp, &forbidden_zero_bit); + rbsp_bits(&rbsp, 2, &nal_ref_idc); + rbsp_bits(&rbsp, 5, &nal_unit_type); + + if (rbsp.error) + return rbsp.error; + if (forbidden_zero_bit != 0 || + nal_ref_idc != 0 || + nal_unit_type != FILLER_DATA) + return -EINVAL; + + nal_h264_read_filler_data(&rbsp); + nal_h264_rbsp_trailing_bits(&rbsp); + + if (rbsp.error) + return rbsp.error; + + return DIV_ROUND_UP(rbsp.pos, 8); +} +EXPORT_SYMBOL_GPL(nal_h264_read_filler); |