diff options
Diffstat (limited to 'libavformat/av1.c')
| -rw-r--r-- | libavformat/av1.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/libavformat/av1.c b/libavformat/av1.c index db7f281fc7..bf77fd2932 100644 --- a/libavformat/av1.c +++ b/libavformat/av1.c @@ -22,6 +22,8 @@ #include "libavutil/mem.h" #include "libavcodec/av1.h" #include "libavcodec/av1_parse.h" +#include "libavcodec/profiles.h" +#include "libavcodec/put_bits.h" #include "av1.h" #include "avio.h" @@ -73,9 +75,233 @@ int ff_av1_filter_obus_buf(const uint8_t *buf, uint8_t **out, int *size) return ret; } +typedef struct AV1SequenceParameters { + uint8_t seq_profile; + uint8_t seq_level_idx_0; + uint8_t seq_tier_0; + uint8_t high_bitdepth; + uint8_t twelve_bit; + uint8_t monochrome; + uint8_t chroma_subsampling_x; + uint8_t chroma_subsampling_y; + uint8_t chroma_sample_position; +} AV1SequenceParameters; + +static inline void uvlc(GetBitContext *gb) +{ + int leading_zeros = 0; + + while (get_bits_left(gb)) { + if (get_bits1(gb)) + break; + leading_zeros++; + } + + if (leading_zeros >= 32) + return; + + skip_bits_long(gb, leading_zeros); +} + +static int parse_color_config(AV1SequenceParameters *seq_params, GetBitContext *gb) +{ + int color_primaries, transfer_characteristics, matrix_coefficients; + + seq_params->high_bitdepth = get_bits1(gb); + if (seq_params->seq_profile == FF_PROFILE_AV1_PROFESSIONAL && seq_params->high_bitdepth) + seq_params->twelve_bit = get_bits1(gb); + else + seq_params->twelve_bit = 0; + + if (seq_params->seq_profile == FF_PROFILE_AV1_HIGH) + seq_params->monochrome = 0; + else + seq_params->monochrome = get_bits1(gb); + + if (get_bits1(gb)) { // color_description_present_flag + color_primaries = get_bits(gb, 8); + transfer_characteristics = get_bits(gb, 8); + matrix_coefficients = get_bits(gb, 8); + } else { + color_primaries = AVCOL_PRI_UNSPECIFIED; + transfer_characteristics = AVCOL_TRC_UNSPECIFIED; + matrix_coefficients = AVCOL_SPC_UNSPECIFIED; + } + + if (seq_params->monochrome) { + skip_bits1(gb); // color_range + seq_params->chroma_subsampling_x = 1; + seq_params->chroma_subsampling_y = 1; + seq_params->chroma_sample_position = 0; + return 0; + } else if (color_primaries == AVCOL_PRI_BT709 && + transfer_characteristics == AVCOL_TRC_IEC61966_2_1 && + matrix_coefficients == AVCOL_SPC_RGB) { + seq_params->chroma_subsampling_x = 0; + seq_params->chroma_subsampling_y = 0; + } else { + skip_bits1(gb); // color_range + + if (seq_params->seq_profile == FF_PROFILE_AV1_MAIN) { + seq_params->chroma_subsampling_x = 1; + seq_params->chroma_subsampling_y = 1; + } else if (seq_params->seq_profile == FF_PROFILE_AV1_HIGH) { + seq_params->chroma_subsampling_x = 0; + seq_params->chroma_subsampling_y = 0; + } else { + if (seq_params->twelve_bit) { + seq_params->chroma_subsampling_x = get_bits1(gb); + if (seq_params->chroma_subsampling_x) + seq_params->chroma_subsampling_y = get_bits1(gb); + else + seq_params->chroma_subsampling_y = 0; + } else { + seq_params->chroma_subsampling_x = 1; + seq_params->chroma_subsampling_y = 0; + } + } + if (seq_params->chroma_subsampling_x && seq_params->chroma_subsampling_y) + seq_params->chroma_sample_position = get_bits(gb, 2); + } + + skip_bits1(gb); // separate_uv_delta_q + + return 0; +} + +static int parse_sequence_header(AV1SequenceParameters *seq_params, const uint8_t *buf, int size) +{ + GetBitContext gb; + int reduced_still_picture_header; + int frame_width_bits_minus_1, frame_height_bits_minus_1; + int size_bits, ret; + + size_bits = get_obu_bit_length(buf, size, AV1_OBU_SEQUENCE_HEADER); + if (size_bits < 0) + return size_bits; + + ret = init_get_bits(&gb, buf, size_bits); + if (ret < 0) + return ret; + + seq_params->seq_profile = get_bits(&gb, 3); + + skip_bits1(&gb); // still_picture + reduced_still_picture_header = get_bits1(&gb); + + if (reduced_still_picture_header) { + seq_params->seq_level_idx_0 = get_bits(&gb, 5); + seq_params->seq_tier_0 = 0; + } else { + int initial_display_delay_present_flag, operating_points_cnt_minus_1; + int decoder_model_info_present_flag, buffer_delay_length_minus_1; + + if (get_bits1(&gb)) { // timing_info_present_flag + skip_bits_long(&gb, 32); // num_units_in_display_tick + skip_bits_long(&gb, 32); // time_scale + + if (get_bits1(&gb)) // equal_picture_interval + uvlc(&gb); // num_ticks_per_picture_minus_1 + + decoder_model_info_present_flag = get_bits1(&gb); + if (decoder_model_info_present_flag) { + buffer_delay_length_minus_1 = get_bits(&gb, 5); + skip_bits_long(&gb, 32); // num_units_in_decoding_tick + skip_bits(&gb, 10); // buffer_removal_time_length_minus_1 (5) + // frame_presentation_time_length_minus_1 (5) + } + } else + decoder_model_info_present_flag = 0; + + initial_display_delay_present_flag = get_bits1(&gb); + + operating_points_cnt_minus_1 = get_bits(&gb, 5); + for (int i = 0; i <= operating_points_cnt_minus_1; i++) { + int seq_level_idx, seq_tier; + + skip_bits(&gb, 12); // operating_point_idc + seq_level_idx = get_bits(&gb, 5); + + if (seq_level_idx > 7) + seq_tier = get_bits1(&gb); + else + seq_tier = 0; + + if (decoder_model_info_present_flag) { + if (get_bits1(&gb)) { // decoder_model_present_for_this_op + skip_bits_long(&gb, buffer_delay_length_minus_1 + 1); // decoder_buffer_delay + skip_bits_long(&gb, buffer_delay_length_minus_1 + 1); // encoder_buffer_delay + skip_bits1(&gb); // low_delay_mode_flag + } + } + + if (initial_display_delay_present_flag) { + if (get_bits1(&gb)) // initial_display_delay_present_for_this_op + skip_bits(&gb, 4); // initial_display_delay_minus_1 + } + + if (i == 0) { + seq_params->seq_level_idx_0 = seq_level_idx; + seq_params->seq_tier_0 = seq_tier; + } + } + } + + frame_width_bits_minus_1 = get_bits(&gb, 4); + frame_height_bits_minus_1 = get_bits(&gb, 4); + + skip_bits(&gb, frame_width_bits_minus_1 + 1); // max_frame_width_minus_1 + skip_bits(&gb, frame_height_bits_minus_1 + 1); // max_frame_height_minus_1 + + if (!reduced_still_picture_header) { + if (get_bits1(&gb)) // frame_id_numbers_present_flag + skip_bits(&gb, 7); // delta_frame_id_length_minus_2 (4), additional_frame_id_length_minus_1 (3) + } + + skip_bits(&gb, 3); // use_128x128_superblock (1), enable_filter_intra (1), enable_intra_edge_filter (1) + + if (!reduced_still_picture_header) { + int enable_order_hint, seq_force_screen_content_tools; + + skip_bits(&gb, 4); // enable_intraintra_compound (1), enable_masked_compound (1) + // enable_warped_motion (1), enable_dual_filter (1) + + enable_order_hint = get_bits1(&gb); + if (enable_order_hint) + skip_bits(&gb, 2); // enable_jnt_comp (1), enable_ref_frame_mvs (1) + + if (get_bits1(&gb)) // seq_choose_screen_content_tools + seq_force_screen_content_tools = 2; + else + seq_force_screen_content_tools = get_bits1(&gb); + + if (seq_force_screen_content_tools) { + if (!get_bits1(&gb)) // seq_choose_integer_mv + skip_bits1(&gb); // seq_force_integer_mv + } + + if (enable_order_hint) + skip_bits(&gb, 3); // order_hint_bits_minus_1 + } + + skip_bits(&gb, 3); // enable_superres (1), enable_cdef (1), enable_restoration (1) + + parse_color_config(seq_params, &gb); + + skip_bits1(&gb); // film_grain_params_present + + if (get_bits_left(&gb)) + return AVERROR_INVALIDDATA; + + return 0; +} + int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size) { AVIOContext *seq_pb = NULL, *meta_pb = NULL; + AV1SequenceParameters seq_params; + PutBitContext pbc; + uint8_t header[4]; uint8_t *seq = NULL, *meta = NULL; int64_t obu_size; int start_pos, type, temporal_id, spatial_id; @@ -106,6 +332,10 @@ int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size) ret = AVERROR_INVALIDDATA; goto fail; } + ret = parse_sequence_header(&seq_params, buf + start_pos, obu_size); + if (ret < 0) + goto fail; + avio_write(seq_pb, buf, len); break; case AV1_OBU_METADATA: @@ -127,6 +357,23 @@ int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size) ret = AVERROR_INVALIDDATA; goto fail; } + + init_put_bits(&pbc, header, sizeof(header)); + + put_bits(&pbc, 1, 1); // marker + put_bits(&pbc, 7, 1); // version + put_bits(&pbc, 3, seq_params.seq_profile); + put_bits(&pbc, 5, seq_params.seq_level_idx_0); + put_bits(&pbc, 1, seq_params.seq_tier_0); + put_bits(&pbc, 1, seq_params.high_bitdepth); + put_bits(&pbc, 1, seq_params.twelve_bit); + put_bits(&pbc, 1, seq_params.monochrome); + put_bits(&pbc, 1, seq_params.chroma_subsampling_x); + put_bits(&pbc, 1, seq_params.chroma_subsampling_y); + put_bits(&pbc, 2, seq_params.chroma_sample_position); + flush_put_bits(&pbc); + + avio_write(pb, header, sizeof(header)); avio_write(pb, seq, seq_size); meta_size = avio_close_dyn_buf(meta_pb, &meta); 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