/* * HEVC Annex B format parser * * Copyright (C) 2012 - 2013 Guillaume Martres * * 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/common.h"#include "libavutil/mem.h" #include "golomb.h"#include "hevc.h"#include "parse.h"#include "ps.h"#include "sei.h"#include "h2645_parse.h"#include "parser.h" #define START_CODE 0x000001 ///< start_code_prefix_one_3bytes #define IS_IRAP_NAL(nal) (nal->type >= 16 && nal->type <= 23)#define IS_IDR_NAL(nal) (nal->type == HEVC_NAL_IDR_W_RADL || nal->type == HEVC_NAL_IDR_N_LP) typedef struct HEVCParserContext {    ParseContext pc;     H2645Packet pkt;    HEVCParamSets ps;    HEVCSEI sei;     int is_avc;    int nal_length_size;    int parsed_extradata;     int poc;    int pocTid0;} HEVCParserContext; static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,                                   AVCodecContext *avctx){    HEVCParserContext *ctx = s->priv_data;    HEVCParamSets *ps = &ctx->ps;    HEVCSEI *sei = &ctx->sei;    GetBitContext *gb = &nal->gb;    const HEVCPPS *pps;    const HEVCSPS *sps;    const HEVCWindow *ow;    int i, num = 0, den = 0;     unsigned int pps_id, first_slice_in_pic_flag, dependent_slice_segment_flag;    enum HEVCSliceType slice_type;     first_slice_in_pic_flag = get_bits1(gb);    s->picture_structure = sei->picture_timing.picture_struct;    s->field_order = sei->picture_timing.picture_struct;     if (IS_IRAP_NAL(nal)) {        s->key_frame = 1;        skip_bits1(gb); // no_output_of_prior_pics_flag    }     pps_id = get_ue_golomb(gb);    if (pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[pps_id]) {        av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", pps_id);        return AVERROR_INVALIDDATA;    }    pps = ps->pps_list[pps_id];    sps = pps->sps;     ow  = &sps->output_window;     s->coded_width  = sps->width;    s->coded_height = sps->height;    s->width        = sps->width  - ow->left_offset - ow->right_offset;    s->height       = sps->height - ow->top_offset  - ow->bottom_offset;    s->format       = sps->pix_fmt;    avctx->profile  = sps->ptl.general_ptl.profile_idc;    avctx->level    = sps->ptl.general_ptl.level_idc;     if (sps->vps->vps_timing_info_present_flag) {        num = sps->vps->vps_num_units_in_tick;        den = sps->vps->vps_time_scale;    } else if (sps->vui.vui_timing_info_present_flag) {        num = sps->vui.vui_num_units_in_tick;        den = sps->vui.vui_time_scale;    }     if (num > 0 && den > 0)        av_reduce(&avctx->framerate.den, &avctx->framerate.num,                  num, den, 1 << 30);     if (!first_slice_in_pic_flag) {        unsigned int slice_segment_addr;        int slice_address_length;         if (pps->dependent_slice_segments_enabled_flag)            dependent_slice_segment_flag = get_bits1(gb);        else            dependent_slice_segment_flag = 0;         slice_address_length = av_ceil_log2_c(sps->ctb_width *                                              sps->ctb_height);        slice_segment_addr = get_bitsz(gb, slice_address_length);        if (slice_segment_addr >= sps->ctb_width * sps->ctb_height) {            av_log(avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",                   slice_segment_addr);            return AVERROR_INVALIDDATA;        }    } else        dependent_slice_segment_flag = 0;     if (dependent_slice_segment_flag)        return 0; /* break; */     for (i = 0; i < pps->num_extra_slice_header_bits; i++)        skip_bits(gb, 1); // slice_reserved_undetermined_flag[]     slice_type = get_ue_golomb_31(gb);    if (!(slice_type == HEVC_SLICE_I || slice_type == HEVC_SLICE_P ||          slice_type == HEVC_SLICE_B)) {        av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",               slice_type);        return AVERROR_INVALIDDATA;    }    s->pict_type = slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :                   slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :                                                AV_PICTURE_TYPE_I;     if (pps->output_flag_present_flag)        skip_bits1(gb); // pic_output_flag     if (sps->separate_colour_plane)        skip_bits(gb, 2);   // colour_plane_id     if (!IS_IDR_NAL(nal)) {        int pic_order_cnt_lsb = get_bits(gb, sps->log2_max_poc_lsb);        s->output_picture_number = ctx->poc =            ff_hevc_compute_poc(sps, ctx->pocTid0, pic_order_cnt_lsb, nal->type);    } else        s->output_picture_number = ctx->poc = 0;     if (nal->temporal_id == 0 &&        nal->type != HEVC_NAL_TRAIL_N &&        nal->type != HEVC_NAL_TSA_N &&        nal->type != HEVC_NAL_STSA_N &&        nal->type != HEVC_NAL_RADL_N &&        nal->type != HEVC_NAL_RASL_N &&        nal->type != HEVC_NAL_RADL_R &&        nal->type != HEVC_NAL_RASL_R)        ctx->pocTid0 = ctx->poc;     return 1; /* no need to evaluate the rest */} /** * Parse NAL units of found picture and decode some basic information. * * @param s parser context. * @param avctx codec context. * @param buf buffer with field/frame data. * @param buf_size size of the buffer. */static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,                           int buf_size, AVCodecContext *avctx){    HEVCParserContext *ctx = s->priv_data;    HEVCParamSets *ps = &ctx->ps;    HEVCSEI *sei = &ctx->sei;    int flags = (H2645_FLAG_IS_NALFF * !!ctx->is_avc) | H2645_FLAG_SMALL_PADDING;    int ret, i;     /* set some sane default values */    s->pict_type         = AV_PICTURE_TYPE_I;    s->key_frame         = 0;    s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;     ff_hevc_reset_sei(sei);     ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx,                                ctx->nal_length_size, AV_CODEC_ID_HEVC, flags);    if (ret < 0)        return ret;     for (i = 0; i < ctx->pkt.nb_nals; i++) {        H2645NAL *nal = &ctx->pkt.nals[i];        GetBitContext *gb = &nal->gb;         if (nal->nuh_layer_id > 0)            continue;         switch (nal->type) {        case HEVC_NAL_VPS:            ff_hevc_decode_nal_vps(gb, avctx, ps);            break;        case HEVC_NAL_SPS:            ff_hevc_decode_nal_sps(gb, avctx, ps, nal->nuh_layer_id, 1);            break;        case HEVC_NAL_PPS:            ff_hevc_decode_nal_pps(gb, avctx, ps);            break;        case HEVC_NAL_SEI_PREFIX:        case HEVC_NAL_SEI_SUFFIX:            ff_hevc_decode_nal_sei(gb, avctx, sei, ps, nal->type);            break;        case HEVC_NAL_TRAIL_N:        case HEVC_NAL_TRAIL_R:        case HEVC_NAL_TSA_N:        case HEVC_NAL_TSA_R:        case HEVC_NAL_STSA_N:        case HEVC_NAL_STSA_R:        case HEVC_NAL_BLA_W_LP:        case HEVC_NAL_BLA_W_RADL:        case HEVC_NAL_BLA_N_LP:        case HEVC_NAL_IDR_W_RADL:        case HEVC_NAL_IDR_N_LP:        case HEVC_NAL_CRA_NUT:        case HEVC_NAL_RADL_N:        case HEVC_NAL_RADL_R:        case HEVC_NAL_RASL_N:        case HEVC_NAL_RASL_R:            if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING) {                s->repeat_pict = 1;            } else if (ctx->sei.picture_timing.picture_struct == HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING) {                s->repeat_pict = 2;            }            ret = hevc_parse_slice_header(s, nal, avctx);            if (ret)                return ret;            break;        }    }    /* didn't find a picture! */    av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);    return -1;} /** * Find the end of the current frame in the bitstream. * @return the position of the first byte of the next frame, or END_NOT_FOUND */static int hevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,                               int buf_size){    HEVCParserContext *ctx = s->priv_data;    ParseContext       *pc = &ctx->pc;    int i;     for (i = 0; i < buf_size; i++) {        int nut, layer_id;         pc->state64 = (pc->state64 << 8) | buf[i];         if (((pc->state64 >> 3 * 8) & 0xFFFFFF) != START_CODE)            continue;         nut = (pc->state64 >> 2 * 8 + 1) & 0x3F;         layer_id = (pc->state64 >> 11) & 0x3F;        if (layer_id > 0)            continue;         // Beginning of access unit        if ((nut >= HEVC_NAL_VPS && nut <= HEVC_NAL_EOB_NUT) || nut == HEVC_NAL_SEI_PREFIX ||            (nut >= 41 && nut <= 44) || (nut >= 48 && nut <= 55)) {            if (pc->frame_start_found) {                pc->frame_start_found = 0;                if (!((pc->state64 >> 6 * 8) & 0xFF))                    return i - 6;                return i - 5;            }        } else if (nut <= HEVC_NAL_RASL_R ||                   (nut >= HEVC_NAL_BLA_W_LP && nut <= HEVC_NAL_CRA_NUT)) {            int first_slice_segment_in_pic_flag = buf[i] >> 7;            if (first_slice_segment_in_pic_flag) {                if (!pc->frame_start_found) {                    pc->frame_start_found = 1;                } else { // First slice of next frame found                    pc->frame_start_found = 0;                    if (!((pc->state64 >> 6 * 8) & 0xFF))                        return i - 6;                    return i - 5;                }            }        }    }     return END_NOT_FOUND;} static int hevc_parse(AVCodecParserContext *s, AVCodecContext *avctx,                      const uint8_t **poutbuf, int *poutbuf_size,                      const uint8_t *buf, int buf_size){    int next;    HEVCParserContext *ctx = s->priv_data;    ParseContext *pc = &ctx->pc;    int is_dummy_buf = !buf_size;    const uint8_t *dummy_buf = buf;     if (avctx->extradata && !ctx->parsed_extradata) {        ff_hevc_decode_extradata(avctx->extradata, avctx->extradata_size, &ctx->ps, &ctx->sei,                                 &ctx->is_avc, &ctx->nal_length_size, avctx->err_recognition,                                 1, avctx);        ctx->parsed_extradata = 1;    }     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {        next = buf_size;    } else {        next = hevc_find_frame_end(s, buf, buf_size);        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {            *poutbuf      = NULL;            *poutbuf_size = 0;            return buf_size;        }    }     is_dummy_buf &= (dummy_buf == buf);     if (!is_dummy_buf)        parse_nal_units(s, buf, buf_size, avctx);     *poutbuf      = buf;    *poutbuf_size = buf_size;    return next;} static void hevc_parser_close(AVCodecParserContext *s){    HEVCParserContext *ctx = s->priv_data;     ff_hevc_ps_uninit(&ctx->ps);    ff_h2645_packet_uninit(&ctx->pkt);    ff_hevc_reset_sei(&ctx->sei);     av_freep(&ctx->pc.buffer);} const AVCodecParser ff_hevc_parser = {    .codec_ids      = { AV_CODEC_ID_HEVC },    .priv_data_size = sizeof(HEVCParserContext),    .parser_parse   = hevc_parse,    .parser_close   = hevc_parser_close,};