X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fh264_parser.c;h=9233cec87f7a156c75b9462b89879b05d5f18b16;hb=f638b67e5790735f34620bf82025c9b9d6fc7216;hp=cfa04c446036e79183d52482217d9a627071c724;hpb=369122dd775c906be06b9c96f03eaedaedb91658;p=ffmpeg diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c index cfa04c44603..9233cec87f7 100644 --- a/libavcodec/h264_parser.c +++ b/libavcodec/h264_parser.c @@ -2,98 +2,477 @@ * H.26L/H.264/AVC/JVT/14496-10/... parser * Copyright (c) 2003 Michael Niedermayer * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** - * @file h264_parser.c - * H.264 / AVC / MPEG4 part10 parser. + * @file + * H.264 / AVC / MPEG-4 part10 parser. * @author Michael Niedermayer */ +#include +#include + +#include "libavutil/avutil.h" +#include "libavutil/error.h" +#include "libavutil/log.h" +#include "libavutil/mem.h" +#include "libavutil/pixfmt.h" + +#include "get_bits.h" +#include "golomb.h" +#include "h264.h" +#include "h264dec.h" +#include "h264_sei.h" +#include "h264_ps.h" +#include "h264data.h" +#include "internal.h" +#include "mpegutils.h" #include "parser.h" -#include "h264_parser.h" -#include +typedef struct H264ParseContext { + ParseContext pc; + H264ParamSets ps; + H264DSPContext h264dsp; + H264POCContext poc; + H264SEIContext sei; + int is_avc; + int nal_length_size; + int got_first; + int picture_structure; +} H264ParseContext; -int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size) +static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, + int buf_size) { int i; uint32_t state; - ParseContext *pc = &(h->s.parse_context); -//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]); + ParseContext *pc = &p->pc; // mb_addr= pc->mb_addr - 1; - state= pc->state; - if(state>13) - state= 7; - - for(i=0; i7, 1->4, 0->5 - else if(buf[i]) state = 7; - else state>>=1; //2->1, 1->0, 0->0 - }else if(state<=5){ - int v= buf[i] & 0x1F; - if(v==7 || v==8 || v==9){ - if(pc->frame_start_found){ + state = pc->state; + if (state > 13) + state = 7; + + for (i = 0; i < buf_size; i++) { + if (state == 7) { + i += p->h264dsp.startcode_find_candidate(buf + i, buf_size - i); + if (i < buf_size) + state = 2; + } else if (state <= 2) { + if (buf[i] == 1) + state ^= 5; // 2->7, 1->4, 0->5 + else if (buf[i]) + state = 7; + else + state >>= 1; // 2->1, 1->0, 0->0 + } else if (state <= 5) { + int nalu_type = buf[i] & 0x1F; + if (nalu_type == NAL_SEI || nalu_type == NAL_SPS || + nalu_type == NAL_PPS || nalu_type == NAL_AUD) { + if (pc->frame_start_found) { i++; goto found; } - }else if(v==1 || v==2 || v==5){ - if(pc->frame_start_found){ - state+=8; + } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA || + nalu_type == NAL_IDR_SLICE) { + if (pc->frame_start_found) { + state += 8; continue; - }else + } else pc->frame_start_found = 1; } - state= 7; - }else{ - if(buf[i] & 0x80) + state = 7; + } else { + // first_mb_in_slice is 0, probably the first nal of a new slice + if (buf[i] & 0x80) goto found; - state= 7; + state = 7; } } - pc->state= state; + pc->state = state; return END_NOT_FOUND; found: - pc->state=7; - pc->frame_start_found= 0; - return i-(state&5); + pc->state = 7; + pc->frame_start_found = 0; + return i - (state & 5); +} + +static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, + AVCodecContext *avctx) +{ + H264PredWeightTable pwt; + int slice_type_nos = s->pict_type & 3; + H264ParseContext *p = s->priv_data; + int list_count, ref_count[2]; + + + if (p->ps.pps->redundant_pic_cnt_present) + get_ue_golomb(gb); // redundant_pic_count + + if (slice_type_nos == AV_PICTURE_TYPE_B) + get_bits1(gb); // direct_spatial_mv_pred + + if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps, + slice_type_nos, p->picture_structure) < 0) + return AVERROR_INVALIDDATA; + + if (slice_type_nos != AV_PICTURE_TYPE_I) { + int list; + for (list = 0; list < list_count; list++) { + if (get_bits1(gb)) { + int index; + for (index = 0; ; index++) { + unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb); + + if (reordering_of_pic_nums_idc < 3) + get_ue_golomb(gb); + else if (reordering_of_pic_nums_idc > 3) { + av_log(avctx, AV_LOG_ERROR, + "illegal reordering_of_pic_nums_idc %d\n", + reordering_of_pic_nums_idc); + return AVERROR_INVALIDDATA; + } else + break; + + if (index >= ref_count[list]) { + av_log(avctx, AV_LOG_ERROR, + "reference count %d overflow\n", index); + return AVERROR_INVALIDDATA; + } + } + } + } + } + + if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) || + (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B)) + ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos, + &pwt); + + if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag + int i; + for (i = 0; i < MAX_MMCO_COUNT; i++) { + MMCOOpcode opcode = get_ue_golomb_31(gb); + if (opcode > (unsigned) MMCO_LONG) { + av_log(avctx, AV_LOG_ERROR, + "illegal memory management control operation %d\n", + opcode); + return AVERROR_INVALIDDATA; + } + if (opcode == MMCO_END) + return 0; + else if (opcode == MMCO_RESET) + return 1; + + if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) + get_ue_golomb(gb); + if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED || + opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) + get_ue_golomb_31(gb); + } + } + + return 0; +} + +/** + * 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 inline int parse_nal_units(AVCodecParserContext *s, + AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + H264ParseContext *p = s->priv_data; + const uint8_t *buf_end = buf + buf_size; + + H2645NAL nal = { NULL }; + + unsigned int pps_id; + unsigned int slice_type; + int state = -1, got_reset = 0; + int field_poc[2]; + int ret; + + /* set some sane default values */ + s->pict_type = AV_PICTURE_TYPE_I; + s->key_frame = 0; + s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN; + + ff_h264_sei_uninit(&p->sei); + + if (!buf_size) + return 0; + + for (;;) { + const SPS *sps; + int src_length, consumed; + buf = avpriv_find_start_code(buf, buf_end, &state); + if (buf >= buf_end) + break; + --buf; + src_length = buf_end - buf; + switch (state & 0x1f) { + case NAL_SLICE: + case NAL_IDR_SLICE: + // Do not walk the whole buffer just to decode slice header + if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) { + /* IDR or disposable slice + * No need to decode many bytes because MMCOs shall not be present. */ + if (src_length > 60) + src_length = 60; + } else { + /* To decode up to MMCOs */ + if (src_length > 1000) + src_length = 1000; + } + break; + } + + consumed = ff_h2645_extract_rbsp(buf, src_length, &nal); + if (consumed < 0) + break; + + ret = init_get_bits(&nal.gb, nal.data, nal.size * 8); + if (ret < 0) + goto fail; + get_bits1(&nal.gb); + nal.ref_idc = get_bits(&nal.gb, 2); + nal.type = get_bits(&nal.gb, 5); + + switch (nal.type) { + case NAL_SPS: + ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps); + break; + case NAL_PPS: + ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps, + nal.size_bits); + break; + case NAL_SEI: + ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx); + break; + case NAL_IDR_SLICE: + s->key_frame = 1; + + p->poc.prev_frame_num = 0; + p->poc.prev_frame_num_offset = 0; + p->poc.prev_poc_msb = + p->poc.prev_poc_lsb = 0; + /* fall through */ + case NAL_SLICE: + get_ue_golomb(&nal.gb); // skip first_mb_in_slice + slice_type = get_ue_golomb_31(&nal.gb); + s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5]; + if (p->sei.recovery_point.recovery_frame_cnt >= 0) { + /* key frame, since recovery_frame_cnt is set */ + s->key_frame = 1; + } + pps_id = get_ue_golomb(&nal.gb); + if (pps_id >= MAX_PPS_COUNT) { + av_log(avctx, AV_LOG_ERROR, + "pps_id %u out of range\n", pps_id); + goto fail; + } + if (!p->ps.pps_list[pps_id]) { + av_log(avctx, AV_LOG_ERROR, + "non-existing PPS %u referenced\n", pps_id); + goto fail; + } + p->ps.pps = (const PPS*)p->ps.pps_list[pps_id]->data; + if (!p->ps.sps_list[p->ps.pps->sps_id]) { + av_log(avctx, AV_LOG_ERROR, + "non-existing SPS %u referenced\n", p->ps.pps->sps_id); + goto fail; + } + p->ps.sps = (SPS*)p->ps.sps_list[p->ps.pps->sps_id]->data; + + sps = p->ps.sps; + + p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num); + + s->coded_width = 16 * sps->mb_width; + s->coded_height = 16 * sps->mb_height; + s->width = s->coded_width - (sps->crop_right + sps->crop_left); + s->height = s->coded_height - (sps->crop_top + sps->crop_bottom); + if (s->width <= 0 || s->height <= 0) { + s->width = s->coded_width; + s->height = s->coded_height; + } + + switch (sps->bit_depth_luma) { + case 9: + if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9; + else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9; + else s->format = AV_PIX_FMT_YUV420P9; + break; + case 10: + if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10; + else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10; + else s->format = AV_PIX_FMT_YUV420P10; + break; + case 8: + if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P; + else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P; + else s->format = AV_PIX_FMT_YUV420P; + break; + default: + s->format = AV_PIX_FMT_NONE; + } + + avctx->profile = ff_h264_get_profile(sps); + avctx->level = sps->level_idc; + + if (sps->frame_mbs_only_flag) { + p->picture_structure = PICT_FRAME; + } else { + if (get_bits1(&nal.gb)) { // field_pic_flag + p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag + } else { + p->picture_structure = PICT_FRAME; + } + } + + if (nal.type == NAL_IDR_SLICE) + get_ue_golomb(&nal.gb); /* idr_pic_id */ + if (sps->poc_type == 0) { + p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb); + + if (p->ps.pps->pic_order_present == 1 && + p->picture_structure == PICT_FRAME) + p->poc.delta_poc_bottom = get_se_golomb(&nal.gb); + } + + if (sps->poc_type == 1 && + !sps->delta_pic_order_always_zero_flag) { + p->poc.delta_poc[0] = get_se_golomb(&nal.gb); + + if (p->ps.pps->pic_order_present == 1 && + p->picture_structure == PICT_FRAME) + p->poc.delta_poc[1] = get_se_golomb(&nal.gb); + } + + /* Decode POC of this picture. + * The prev_ values needed for decoding POC of the next picture are not set here. */ + field_poc[0] = field_poc[1] = INT_MAX; + ff_h264_init_poc(field_poc, &s->output_picture_number, sps, + &p->poc, p->picture_structure, nal.ref_idc); + + /* Continue parsing to check if MMCO_RESET is present. + * FIXME: MMCO_RESET could appear in non-first slice. + * Maybe, we should parse all undisposable non-IDR slice of this + * picture until encountering MMCO_RESET in a slice of it. */ + if (nal.ref_idc && nal.type != NAL_IDR_SLICE) { + got_reset = scan_mmco_reset(s, &nal.gb, avctx); + if (got_reset < 0) + goto fail; + } + + /* Set up the prev_ values for decoding POC of the next picture. */ + p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num; + p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset; + if (nal.ref_idc != 0) { + if (!got_reset) { + p->poc.prev_poc_msb = p->poc.poc_msb; + p->poc.prev_poc_lsb = p->poc.poc_lsb; + } else { + p->poc.prev_poc_msb = 0; + p->poc.prev_poc_lsb = + p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0]; + } + } + + if (sps->pic_struct_present_flag) { + switch (p->sei.picture_timing.pic_struct) { + case SEI_PIC_STRUCT_TOP_FIELD: + case SEI_PIC_STRUCT_BOTTOM_FIELD: + s->repeat_pict = 0; + break; + case SEI_PIC_STRUCT_FRAME: + case SEI_PIC_STRUCT_TOP_BOTTOM: + case SEI_PIC_STRUCT_BOTTOM_TOP: + s->repeat_pict = 1; + break; + case SEI_PIC_STRUCT_TOP_BOTTOM_TOP: + case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: + s->repeat_pict = 2; + break; + case SEI_PIC_STRUCT_FRAME_DOUBLING: + s->repeat_pict = 3; + break; + case SEI_PIC_STRUCT_FRAME_TRIPLING: + s->repeat_pict = 5; + break; + default: + s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0; + break; + } + } else { + s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0; + } + + if (p->picture_structure == PICT_FRAME) { + s->picture_structure = AV_PICTURE_STRUCTURE_FRAME; + if (sps->pic_struct_present_flag) { + switch (p->sei.picture_timing.pic_struct) { + case SEI_PIC_STRUCT_TOP_BOTTOM: + case SEI_PIC_STRUCT_TOP_BOTTOM_TOP: + s->field_order = AV_FIELD_TT; + break; + case SEI_PIC_STRUCT_BOTTOM_TOP: + case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM: + s->field_order = AV_FIELD_BB; + break; + default: + s->field_order = AV_FIELD_PROGRESSIVE; + break; + } + } else { + if (field_poc[0] < field_poc[1]) + s->field_order = AV_FIELD_TT; + else if (field_poc[0] > field_poc[1]) + s->field_order = AV_FIELD_BB; + else + s->field_order = AV_FIELD_PROGRESSIVE; + } + } else { + if (p->picture_structure == PICT_TOP_FIELD) + s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD; + else + s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD; + s->field_order = AV_FIELD_UNKNOWN; + } + + av_freep(&nal.rbsp_buffer); + return 0; /* no need to evaluate the rest */ + } + buf += consumed; + } + /* didn't find a picture! */ + av_log(avctx, AV_LOG_ERROR, "missing picture in access unit\n"); +fail: + av_freep(&nal.rbsp_buffer); + return -1; } static int h264_parse(AVCodecParserContext *s, @@ -101,28 +480,53 @@ static int h264_parse(AVCodecParserContext *s, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size) { - H264Context *h = s->priv_data; - ParseContext *pc = &h->s.parse_context; + H264ParseContext *p = s->priv_data; + ParseContext *pc = &p->pc; int next; - if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ - next= buf_size; - }else{ - next= ff_h264_find_frame_end(h, buf, buf_size); + if (!p->got_first) { + p->got_first = 1; + if (avctx->extradata_size) { + ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size, + &p->ps, &p->is_avc, &p->nal_length_size, + avctx->err_recognition, avctx); + } + } + + if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { + next = buf_size; + } else { + next = h264_find_frame_end(p, buf, buf_size); if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { - *poutbuf = NULL; + *poutbuf = NULL; *poutbuf_size = 0; return buf_size; } - if(next<0 && next != END_NOT_FOUND){ - assert(pc->last_index + next >= 0 ); - ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state + if (next < 0 && next != END_NOT_FOUND) { + assert(pc->last_index + next >= 0); + h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state } } - *poutbuf = buf; + parse_nal_units(s, avctx, buf, buf_size); + + if (p->sei.picture_timing.cpb_removal_delay >= 0) { + s->dts_sync_point = p->sei.buffering_period.present; + s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay; + s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay; + } else { + s->dts_sync_point = INT_MIN; + s->dts_ref_dts_delta = INT_MIN; + s->pts_dts_delta = INT_MIN; + } + + if (s->flags & PARSER_FLAG_ONCE) { + s->flags &= PARSER_FLAG_COMPLETE_FRAMES; + } + + *poutbuf = buf; *poutbuf_size = buf_size; return next; } @@ -132,40 +536,62 @@ static int h264_split(AVCodecContext *avctx, { int i; uint32_t state = -1; - int has_sps= 0; - - for(i=0; i<=buf_size; i++){ - if((state&0xFFFFFF1F) == 0x107) - has_sps=1; -/* if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){ - }*/ - if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){ - if(has_sps){ - while(i>4 && buf[i-5]==0) i--; - return i-4; + int has_sps = 0; + + for (i = 0; i <= buf_size; i++) { + if ((state & 0xFFFFFF1F) == 0x107) + has_sps = 1; + /* if((state&0xFFFFFF1F) == 0x101 || + * (state&0xFFFFFF1F) == 0x102 || + * (state&0xFFFFFF1F) == 0x105) { + * } + */ + if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 && + (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 && + (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d && + (state & 0xFFFFFF1F) != 0x10f) { + if (has_sps) { + while (i > 4 && buf[i - 5] == 0) + i--; + return i - 4; } } - if (ipriv_data; - ParseContext *pc = &h->s.parse_context; + H264ParseContext *p = s->priv_data; + ParseContext *pc = &p->pc; + int i; av_free(pc->buffer); + + ff_h264_sei_uninit(&p->sei); + + for (i = 0; i < FF_ARRAY_ELEMS(p->ps.sps_list); i++) + av_buffer_unref(&p->ps.sps_list[i]); + + for (i = 0; i < FF_ARRAY_ELEMS(p->ps.pps_list); i++) + av_buffer_unref(&p->ps.pps_list[i]); } +static av_cold int init(AVCodecParserContext *s) +{ + H264ParseContext *p = s->priv_data; + + ff_h264dsp_init(&p->h264dsp, 8, 1); + return 0; +} -AVCodecParser h264_parser = { - { CODEC_ID_H264, - CODEC_ID_H264_VDPAU }, - sizeof(H264Context), - NULL, - h264_parse, - close, - h264_split, +AVCodecParser ff_h264_parser = { + .codec_ids = { AV_CODEC_ID_H264 }, + .priv_data_size = sizeof(H264ParseContext), + .parser_init = init, + .parser_parse = h264_parse, + .parser_close = h264_close, + .split = h264_split, };