/* * 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 "libavutil/mem.h"#include "libavcodec/h264.h"#include "libavcodec/get_bits.h"#include "avio.h"#include "avc.h"#include "avio_internal.h"#include "nal.h" 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_nal_parse_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;} 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;}