diff options
Diffstat (limited to 'libavcodec/h264_parser.c')
-rw-r--r-- | libavcodec/h264_parser.c | 168 |
1 files changed, 114 insertions, 54 deletions
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c index 672411e..e906fd5 100644 --- a/libavcodec/h264_parser.c +++ b/libavcodec/h264_parser.c @@ -2,20 +2,20 @@ * H.26L/H.264/AVC/JVT/14496-10/... parser * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -25,6 +25,8 @@ * @author Michael Niedermayer <michaelni@gmx.at> */ +#define UNCHECKED_BITSTREAM_READER 1 + #include "libavutil/attributes.h" #include "parser.h" #include "h264data.h" @@ -32,8 +34,6 @@ #include "internal.h" #include "mpegutils.h" -#include <assert.h> - typedef struct H264ParseContext { H264Context h; ParseContext pc; @@ -45,18 +45,36 @@ static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, int buf_size) { H264Context *h = &p->h; - int i; + int i, j; uint32_t state; ParseContext *pc = &p->pc; + + int next_avc= h->is_avc ? 0 : buf_size; // mb_addr= pc->mb_addr - 1; state = pc->state; if (state > 13) state = 7; + if (h->is_avc && !h->nal_length_size) + av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n"); + for (i = 0; i < buf_size; i++) { + if (i >= next_avc) { + int nalsize = 0; + i = next_avc; + for (j = 0; j < h->nal_length_size; j++) + nalsize = (nalsize << 8) | buf[i++]; + if (nalsize <= 0 || nalsize > buf_size - i) { + av_log(h->avctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i); + return buf_size; + } + next_avc = i + nalsize; + state = 5; + } + if (state == 7) { - i += h->h264dsp.startcode_find_candidate(buf + i, buf_size - i); - if (i < buf_size) + i += h->h264dsp.startcode_find_candidate(buf + i, next_avc - i); + if (i < next_avc) state = 2; } else if (state <= 2) { if (buf[i] == 1) @@ -75,27 +93,40 @@ static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf, } } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA || nalu_type == NAL_IDR_SLICE) { + state += 8; + continue; + } + state = 7; + } else { + h->parse_history[h->parse_history_count++]= buf[i]; + if (h->parse_history_count>5) { + unsigned int mb, last_mb= h->parse_last_mb; + GetBitContext gb; + + init_get_bits(&gb, h->parse_history, 8*h->parse_history_count); + h->parse_history_count=0; + mb= get_ue_golomb_long(&gb); + h->parse_last_mb= mb; if (pc->frame_start_found) { - state += 8; - continue; + if (mb <= last_mb) + goto found; } else pc->frame_start_found = 1; + state = 7; } - 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; } } pc->state = state; + if (h->is_avc) + return next_avc; return END_NOT_FOUND; found: pc->state = 7; pc->frame_start_found = 0; - return i - (state & 5); + if (h->is_avc) + return next_avc; + return i - (state & 5) - 5 * (state > 7); } static int scan_mmco_reset(AVCodecParserContext *s) @@ -180,15 +211,16 @@ static int scan_mmco_reset(AVCodecParserContext *s) */ static inline int parse_nal_units(AVCodecParserContext *s, AVCodecContext *avctx, - const uint8_t *buf, int buf_size) + const uint8_t * const buf, int buf_size) { H264ParseContext *p = s->priv_data; H264Context *h = &p->h; - const uint8_t *buf_end = buf + buf_size; + int buf_index, next_avc; unsigned int pps_id; unsigned int slice_type; int state = -1, got_reset = 0; const uint8_t *ptr; + int q264 = buf_size >=4 && !memcmp("Q264", buf, 4); int field_poc[2]; /* set some sane default values */ @@ -198,17 +230,31 @@ static inline int parse_nal_units(AVCodecParserContext *s, h->avctx = avctx; ff_h264_reset_sei(h); + h->sei_fpa.frame_packing_arrangement_cancel_flag = -1; if (!buf_size) return 0; + buf_index = 0; + next_avc = h->is_avc ? 0 : buf_size; for (;;) { - int src_length, dst_length, consumed; - buf = avpriv_find_start_code(buf, buf_end, &state); - if (buf >= buf_end) - break; - --buf; - src_length = buf_end - buf; + int src_length, dst_length, consumed, nalsize = 0; + + if (buf_index >= next_avc) { + nalsize = get_avc_nalsize(h, buf, buf_size, &buf_index); + if (nalsize < 0) + break; + next_avc = buf_index + nalsize; + } else { + buf_index = find_start_code(buf, buf_size, buf_index, next_avc); + if (buf_index >= buf_size) + break; + if (buf_index >= next_avc) + continue; + } + src_length = next_avc - buf_index; + + state = buf[buf_index]; switch (state & 0x1f) { case NAL_SLICE: case NAL_IDR_SLICE: @@ -225,10 +271,13 @@ static inline int parse_nal_units(AVCodecParserContext *s, } break; } - ptr = ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length); + ptr = ff_h264_decode_nal(h, buf + buf_index, &dst_length, + &consumed, src_length); if (!ptr || dst_length < 0) break; + buf_index += consumed; + init_get_bits(&h->gb, ptr, 8 * dst_length); switch (h->nal_unit_type) { case NAL_SPS: @@ -249,7 +298,7 @@ static inline int parse_nal_units(AVCodecParserContext *s, h->prev_poc_lsb = 0; /* fall through */ case NAL_SLICE: - get_ue_golomb(&h->gb); // skip first_mb_in_slice + get_ue_golomb_long(&h->gb); // skip first_mb_in_slice slice_type = get_ue_golomb_31(&h->gb); s->pict_type = golomb_to_pict_type[slice_type % 5]; if (h->sei_recovery_frame_cnt >= 0) { @@ -276,6 +325,9 @@ static inline int parse_nal_units(AVCodecParserContext *s, h->sps = *h->sps_buffers[h->pps.sps_id]; h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num); + if(h->sps.ref_frame_count <= 1 && h->pps.ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I) + s->key_frame = 1; + s->coded_width = 16 * h->sps.mb_width; s->coded_height = 16 * h->sps.mb_height; s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left); @@ -429,10 +481,11 @@ static inline int parse_nal_units(AVCodecParserContext *s, return 0; /* no need to evaluate the rest */ } - buf += consumed; } + if (q264) + return 0; /* didn't find a picture! */ - av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n"); + av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size); return -1; } @@ -450,14 +503,13 @@ static int h264_parse(AVCodecParserContext *s, p->got_first = 1; if (avctx->extradata_size) { h->avctx = avctx; - // must be done like in the decoder. - // otherwise opening the parser, creating extradata, - // and then closing and opening again + // must be done like in decoder, otherwise opening the parser, + // letting it create extradata and then closing and opening again // will cause has_b_frames to be always set. - // NB: estimate_timings_from_pts behaves exactly like this. + // Note that estimate_timings_from_pts does exactly this. if (!avctx->has_b_frames) h->low_delay = 1; - ff_h264_decode_extradata(h); + ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size); } } @@ -473,13 +525,15 @@ static int h264_parse(AVCodecParserContext *s, } if (next < 0 && next != END_NOT_FOUND) { - assert(pc->last_index + next >= 0); + av_assert1(pc->last_index + next >= 0); h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state } } parse_nal_units(s, avctx, buf, buf_size); + if (avctx->framerate.num) + avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1})); if (h->sei_cpb_removal_delay >= 0) { s->dts_sync_point = h->sei_buffering_period_present; s->dts_ref_dts_delta = h->sei_cpb_removal_delay; @@ -502,41 +556,47 @@ static int h264_parse(AVCodecParserContext *s, static int h264_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { - int i; uint32_t state = -1; int has_sps = 0; + int has_pps = 0; + const uint8_t *ptr = buf, *end = buf + buf_size; + int nalu_type; - for (i = 0; i <= buf_size; i++) { - if ((state & 0xFFFFFF1F) == 0x107) + while (ptr < end) { + ptr = avpriv_find_start_code(ptr, end, &state); + if ((state & 0xFFFFFF00) != 0x100) + break; + nalu_type = state & 0x1F; + if (nalu_type == NAL_SPS) { has_sps = 1; - /* if((state&0xFFFFFF1F) == 0x101 || - * (state&0xFFFFFF1F) == 0x102 || - * (state&0xFFFFFF1F) == 0x105) { + } else if (nalu_type == NAL_PPS) + has_pps = 1; + /* else if (nalu_type == 0x01 || + * nalu_type == 0x02 || + * nalu_type == 0x05) { * } */ - if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 && - (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 && - (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d && - (state & 0xFFFFFF1F) != 0x10f) { + else if ((nalu_type != NAL_SEI || has_pps) && + nalu_type != NAL_AUD && nalu_type != NAL_SPS_EXT && + nalu_type != 0x0f) { if (has_sps) { - while (i > 4 && buf[i - 5] == 0) - i--; - return i - 4; + while (ptr - 4 > buf && ptr[-5] == 0) + ptr--; + return ptr - 4 - buf; } } - if (i < buf_size) - state = (state << 8) | buf[i]; } + return 0; } -static void close(AVCodecParserContext *s) +static void h264_close(AVCodecParserContext *s) { H264ParseContext *p = s->priv_data; H264Context *h = &p->h; ParseContext *pc = &p->pc; - av_free(pc->buffer); + av_freep(&pc->buffer); ff_h264_free_context(h); } @@ -561,6 +621,6 @@ AVCodecParser ff_h264_parser = { .priv_data_size = sizeof(H264ParseContext), .parser_init = init, .parser_parse = h264_parse, - .parser_close = close, + .parser_close = h264_close, .split = h264_split, }; |