X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Favc.c;h=b5e29213881744cec92d066158c558a2f6d39ef0;hb=d92f38c179591a608390ffa9fee59c309142e79d;hp=ec50033a0420ea7402c3eb9b0dbbd26c740ee568;hpb=f05f210526a3dc2d9fa6b1c228e3907ebd1d43c6;p=ffmpeg diff --git a/libavformat/avc.c b/libavformat/avc.c index ec50033a042..b5e29213881 100644 --- a/libavformat/avc.c +++ b/libavformat/avc.c @@ -21,11 +21,13 @@ #include "libavutil/intreadwrite.h" #include "libavcodec/h264.h" +#include "libavcodec/get_bits.h" #include "avformat.h" #include "avio.h" #include "avc.h" +#include "avio_internal.h" -static const uint8_t *ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end) +static const uint8_t *avc_find_startcode_internal(const uint8_t *p, const uint8_t *end) { const uint8_t *a = p + 4 - ((intptr_t)p & 3); @@ -63,7 +65,7 @@ static const uint8_t *ff_avc_find_startcode_internal(const uint8_t *p, const uin } const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){ - const uint8_t *out= ff_avc_find_startcode_internal(p, end); + const uint8_t *out = avc_find_startcode_internal(p, end); if(p UINT16_MAX || nb_sps_ext >= 256) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + avio_wb16(sps_ext_pb, size); + avio_write(sps_ext_pb, buf, size); } buf += size; } - sps_size = avio_close_dyn_buf(sps_pb, &sps); - pps_size = avio_close_dyn_buf(pps_pb, &pps); + sps_size = avio_get_dyn_buf(sps_pb, &sps); + pps_size = avio_get_dyn_buf(pps_pb, &pps); + sps_ext_size = avio_get_dyn_buf(sps_ext_pb, &sps_ext); if (sps_size < 6 || !pps_size) { ret = AVERROR_INVALIDDATA; @@ -182,13 +195,24 @@ int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len) avio_w8(pb, nb_pps); /* number of pps */ avio_write(pb, pps, pps_size); + if (sps[3] != 66 && sps[3] != 77 && sps[3] != 88) { + H264SPS seq; + ret = ff_avc_decode_sps(&seq, sps + 3, sps_size - 3); + if (ret < 0) + goto fail; + + avio_w8(pb, 0xfc | seq.chroma_format_idc); /* 6 bits reserved (111111) + chroma_format_idc */ + avio_w8(pb, 0xf8 | (seq.bit_depth_luma - 8)); /* 5 bits reserved (11111) + bit_depth_luma_minus8 */ + avio_w8(pb, 0xf8 | (seq.bit_depth_chroma - 8)); /* 5 bits reserved (11111) + bit_depth_chroma_minus8 */ + avio_w8(pb, nb_sps_ext); /* number of sps ext */ + if (nb_sps_ext) + avio_write(pb, sps_ext, sps_ext_size); + } + fail: - if (!sps) - avio_close_dyn_buf(sps_pb, &sps); - if (!pps) - avio_close_dyn_buf(pps_pb, &pps); - av_free(sps); - av_free(pps); + ffio_free_dyn_buf(&sps_pb); + ffio_free_dyn_buf(&pps_pb); + ffio_free_dyn_buf(&sps_ext_pb); av_free(start); return ret; @@ -241,3 +265,187 @@ const uint8_t *ff_avc_mp4_find_startcode(const uint8_t *start, return start + res; } + +uint8_t *ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len, + uint32_t *dst_len, int header_len) +{ + uint8_t *dst; + uint32_t i, len; + + dst = av_malloc(src_len + AV_INPUT_BUFFER_PADDING_SIZE); + if (!dst) + return NULL; + + /* NAL unit header */ + i = len = 0; + while (i < header_len && i < src_len) + dst[len++] = src[i++]; + + while (i + 2 < src_len) + if (!src[i] && !src[i + 1] && src[i + 2] == 3) { + dst[len++] = src[i++]; + dst[len++] = src[i++]; + i++; // remove emulation_prevention_three_byte + } else + dst[len++] = src[i++]; + + while (i < src_len) + dst[len++] = src[i++]; + + memset(dst + len, 0, AV_INPUT_BUFFER_PADDING_SIZE); + + *dst_len = len; + return dst; +} + +static const AVRational avc_sample_aspect_ratio[17] = { + { 0, 1 }, + { 1, 1 }, + { 12, 11 }, + { 10, 11 }, + { 16, 11 }, + { 40, 33 }, + { 24, 11 }, + { 20, 11 }, + { 32, 11 }, + { 80, 33 }, + { 18, 11 }, + { 15, 11 }, + { 64, 33 }, + { 160, 99 }, + { 4, 3 }, + { 3, 2 }, + { 2, 1 }, +}; + +static inline int get_ue_golomb(GetBitContext *gb) { + int i; + for (i = 0; i < 32 && !get_bits1(gb); i++) + ; + return get_bitsz(gb, i) + (1 << i) - 1; +} + +static inline int get_se_golomb(GetBitContext *gb) { + int v = get_ue_golomb(gb) + 1; + int sign = -(v & 1); + return ((v >> 1) ^ sign) - sign; +} + +int ff_avc_decode_sps(H264SPS *sps, const uint8_t *buf, int buf_size) +{ + int i, j, ret, rbsp_size, aspect_ratio_idc, pic_order_cnt_type; + int num_ref_frames_in_pic_order_cnt_cycle; + int delta_scale, lastScale = 8, nextScale = 8; + int sizeOfScalingList; + GetBitContext gb; + uint8_t *rbsp_buf; + + rbsp_buf = ff_nal_unit_extract_rbsp(buf, buf_size, &rbsp_size, 0); + if (!rbsp_buf) + return AVERROR(ENOMEM); + + ret = init_get_bits8(&gb, rbsp_buf, rbsp_size); + if (ret < 0) + goto end; + + memset(sps, 0, sizeof(*sps)); + + sps->profile_idc = get_bits(&gb, 8); + sps->constraint_set_flags |= get_bits1(&gb) << 0; // constraint_set0_flag + sps->constraint_set_flags |= get_bits1(&gb) << 1; // constraint_set1_flag + sps->constraint_set_flags |= get_bits1(&gb) << 2; // constraint_set2_flag + sps->constraint_set_flags |= get_bits1(&gb) << 3; // constraint_set3_flag + sps->constraint_set_flags |= get_bits1(&gb) << 4; // constraint_set4_flag + sps->constraint_set_flags |= get_bits1(&gb) << 5; // constraint_set5_flag + skip_bits(&gb, 2); // reserved_zero_2bits + sps->level_idc = get_bits(&gb, 8); + sps->id = get_ue_golomb(&gb); + + 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->chroma_format_idc = get_ue_golomb(&gb); // chroma_format_idc + if (sps->chroma_format_idc == 3) { + skip_bits1(&gb); // separate_colour_plane_flag + } + sps->bit_depth_luma = get_ue_golomb(&gb) + 8; + sps->bit_depth_chroma = get_ue_golomb(&gb) + 8; + skip_bits1(&gb); // qpprime_y_zero_transform_bypass_flag + if (get_bits1(&gb)) { // seq_scaling_matrix_present_flag + for (i = 0; i < ((sps->chroma_format_idc != 3) ? 8 : 12); i++) { + if (!get_bits1(&gb)) // seq_scaling_list_present_flag + continue; + lastScale = 8; + nextScale = 8; + sizeOfScalingList = i < 6 ? 16 : 64; + for (j = 0; j < sizeOfScalingList; j++) { + if (nextScale != 0) { + delta_scale = get_se_golomb(&gb); + nextScale = (lastScale + delta_scale) & 0xff; + } + lastScale = nextScale == 0 ? lastScale : nextScale; + } + } + } + } else { + sps->chroma_format_idc = 1; + sps->bit_depth_luma = 8; + sps->bit_depth_chroma = 8; + } + + get_ue_golomb(&gb); // log2_max_frame_num_minus4 + pic_order_cnt_type = get_ue_golomb(&gb); + + if (pic_order_cnt_type == 0) { + get_ue_golomb(&gb); // log2_max_pic_order_cnt_lsb_minus4 + } else if (pic_order_cnt_type == 1) { + skip_bits1(&gb); // delta_pic_order_always_zero + get_se_golomb(&gb); // offset_for_non_ref_pic + get_se_golomb(&gb); // offset_for_top_to_bottom_field + num_ref_frames_in_pic_order_cnt_cycle = get_ue_golomb(&gb); + for (i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++) + get_se_golomb(&gb); // offset_for_ref_frame + } + + get_ue_golomb(&gb); // max_num_ref_frames + skip_bits1(&gb); // gaps_in_frame_num_value_allowed_flag + get_ue_golomb(&gb); // pic_width_in_mbs_minus1 + get_ue_golomb(&gb); // pic_height_in_map_units_minus1 + + sps->frame_mbs_only_flag = get_bits1(&gb); + if (!sps->frame_mbs_only_flag) + skip_bits1(&gb); // mb_adaptive_frame_field_flag + + skip_bits1(&gb); // direct_8x8_inference_flag + + if (get_bits1(&gb)) { // frame_cropping_flag + get_ue_golomb(&gb); // frame_crop_left_offset + get_ue_golomb(&gb); // frame_crop_right_offset + get_ue_golomb(&gb); // frame_crop_top_offset + get_ue_golomb(&gb); // frame_crop_bottom_offset + } + + if (get_bits1(&gb)) { // vui_parameters_present_flag + if (get_bits1(&gb)) { // aspect_ratio_info_present_flag + aspect_ratio_idc = get_bits(&gb, 8); + if (aspect_ratio_idc == 0xff) { + sps->sar.num = get_bits(&gb, 16); + sps->sar.den = get_bits(&gb, 16); + } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(avc_sample_aspect_ratio)) { + sps->sar = avc_sample_aspect_ratio[aspect_ratio_idc]; + } + } + } + + if (!sps->sar.den) { + sps->sar.num = 1; + sps->sar.den = 1; + } + + ret = 0; + end: + av_free(rbsp_buf); + return ret; +}