/* * AVC helper functions for muxers * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com> * * 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/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 *avc_find_startcode_internal(const uint8_t *p, const uint8_t *end) { const uint8_t *a = p + 4 - ((intptr_t)p & 3); for (end -= 3; p < a && p < end; p++) { if (p[0] == 0 && p[1] == 0 && p[2] == 1) return p; } for (end -= 3; p < end; p += 4) { uint32_t x = *(const uint32_t*)p; // if ((x - 0x01000100) & (~x) & 0x80008000) // little endian // if ((x - 0x00010001) & (~x) & 0x00800080) // big endian if ((x - 0x01010101) & (~x) & 0x80808080) { // generic if (p[1] == 0) { if (p[0] == 0 && p[2] == 1) return p; if (p[2] == 0 && p[3] == 1) return p+1; } if (p[3] == 0) { if (p[2] == 0 && p[4] == 1) return p+2; if (p[4] == 0 && p[5] == 1) return p+3; } } } for (end += 3; p < end; p++) { if (p[0] == 0 && p[1] == 0 && p[2] == 1) return p; } return end + 3; } const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){ const uint8_t *out = avc_find_startcode_internal(p, end); if(p<out && out<end && !out[-1]) out--; return out; } static int avc_parse_nal_units(AVIOContext *pb, NALUList *list, const uint8_t *buf_in, int size) { const uint8_t *p = buf_in; const uint8_t *end = p + size; const uint8_t *nal_start, *nal_end; size = 0; nal_start = ff_avc_find_startcode(p, end); for (;;) { const size_t nalu_limit = SIZE_MAX / sizeof(*list->nalus); while (nal_start < end && !*(nal_start++)); if (nal_start == end) break; nal_end = ff_avc_find_startcode(nal_start, end); if (pb) { avio_wb32(pb, nal_end - nal_start); avio_write(pb, nal_start, nal_end - nal_start); } else if (list->nb_nalus >= nalu_limit) { return AVERROR(ERANGE); } else { NALU *tmp = av_fast_realloc(list->nalus, &list->nalus_array_size, (list->nb_nalus + 1) * sizeof(*list->nalus)); if (!tmp) return AVERROR(ENOMEM); list->nalus = tmp; tmp[list->nb_nalus++] = (NALU){ .offset = nal_start - p, .size = nal_end - nal_start }; } size += 4 + nal_end - nal_start; nal_start = nal_end; } return size; } int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size) { return avc_parse_nal_units(pb, NULL, buf_in, size); } int ff_nal_units_create_list(NALUList *list, const uint8_t *buf, int size) { list->nb_nalus = 0; return avc_parse_nal_units(NULL, list, buf, size); } void ff_nal_units_write_list(const NALUList *list, AVIOContext *pb, const uint8_t *buf) { for (unsigned i = 0; i < list->nb_nalus; i++) { avio_wb32(pb, list->nalus[i].size); avio_write(pb, buf + list->nalus[i].offset, list->nalus[i].size); } } int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size) { AVIOContext *pb; int ret = avio_open_dyn_buf(&pb); if(ret < 0) return ret; ff_avc_parse_nal_units(pb, buf_in, *size); *size = avio_close_dyn_buf(pb, buf); return 0; } int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len) { AVIOContext *sps_pb = NULL, *pps_pb = NULL, *sps_ext_pb = NULL; uint8_t *buf, *end, *start; uint8_t *sps, *pps, *sps_ext; uint32_t sps_size = 0, pps_size = 0, sps_ext_size = 0; int ret, nb_sps = 0, nb_pps = 0, nb_sps_ext = 0; if (len <= 6) return AVERROR_INVALIDDATA; /* check for H.264 start code */ if (AV_RB32(data) != 0x00000001 && AV_RB24(data) != 0x000001) { avio_write(pb, data, len); return 0; } ret = ff_avc_parse_nal_units_buf(data, &buf, &len); if (ret < 0) return ret; start = buf; end = buf + len; ret = avio_open_dyn_buf(&sps_pb); if (ret < 0) goto fail; ret = avio_open_dyn_buf(&pps_pb); if (ret < 0) goto fail; ret = avio_open_dyn_buf(&sps_ext_pb); if (ret < 0) goto fail; /* look for sps and pps */ while (end - buf > 4) { uint32_t size; uint8_t nal_type; size = FFMIN(AV_RB32(buf), end - buf - 4); buf += 4; nal_type = buf[0] & 0x1f; if (nal_type == 7) { /* SPS */ nb_sps++; if (size > UINT16_MAX || nb_sps >= H264_MAX_SPS_COUNT) { ret = AVERROR_INVALIDDATA; goto fail; } avio_wb16(sps_pb, size); avio_write(sps_pb, buf, size); } else if (nal_type == 8) { /* PPS */ nb_pps++; if (size > UINT16_MAX || nb_pps >= H264_MAX_PPS_COUNT) { ret = AVERROR_INVALIDDATA; goto fail; } avio_wb16(pps_pb, size); avio_write(pps_pb, buf, size); } else if (nal_type == 13) { /* SPS_EXT */ nb_sps_ext++; if (size > 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_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; goto fail; } avio_w8(pb, 1); /* version */ avio_w8(pb, sps[3]); /* profile */ avio_w8(pb, sps[4]); /* profile compat */ avio_w8(pb, sps[5]); /* level */ avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */ avio_w8(pb, 0xe0 | nb_sps); /* 3 bits reserved (111) + 5 bits number of sps */ avio_write(pb, sps, sps_size); 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: ffio_free_dyn_buf(&sps_pb); ffio_free_dyn_buf(&pps_pb); ffio_free_dyn_buf(&sps_ext_pb); av_free(start); return ret; } int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size) { uint16_t sps_size, pps_size; uint8_t *out; int out_size; *buf = NULL; if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001)) return 0; if (*size < 11 || in[0] != 1) return AVERROR_INVALIDDATA; sps_size = AV_RB16(&in[6]); if (11 + sps_size > *size) return AVERROR_INVALIDDATA; pps_size = AV_RB16(&in[9 + sps_size]); if (11 + sps_size + pps_size > *size) return AVERROR_INVALIDDATA; out_size = 8 + sps_size + pps_size; out = av_mallocz(out_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!out) return AVERROR(ENOMEM); AV_WB32(&out[0], 0x00000001); memcpy(out + 4, &in[8], sps_size); AV_WB32(&out[4 + sps_size], 0x00000001); memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size); *buf = out; *size = out_size; return 0; } const uint8_t *ff_avc_mp4_find_startcode(const uint8_t *start, const uint8_t *end, int nal_length_size) { unsigned int res = 0; if (end - start < nal_length_size) return NULL; while (nal_length_size--) res = (res << 8) | *start++; if (res > end - start) return NULL; 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; }