diff options
Diffstat (limited to 'ffmpeg/libavformat/avc.c')
| -rw-r--r-- | ffmpeg/libavformat/avc.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/ffmpeg/libavformat/avc.c b/ffmpeg/libavformat/avc.c deleted file mode 100644 index f5c513b..0000000 --- a/ffmpeg/libavformat/avc.c +++ /dev/null @@ -1,193 +0,0 @@ -/* - * 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 "avformat.h" -#include "avio.h" -#include "avc.h" - -static const uint8_t *ff_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= ff_avc_find_startcode_internal(p, end); - if(p<out && out<end && !out[-1]) out--; - return out; -} - -int ff_avc_parse_nal_units(AVIOContext *pb, 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 (;;) { - while (nal_start < end && !*(nal_start++)); - if (nal_start == end) - break; - - nal_end = ff_avc_find_startcode(nal_start, end); - avio_wb32(pb, nal_end - nal_start); - avio_write(pb, nal_start, nal_end - nal_start); - size += 4 + nal_end - nal_start; - nal_start = nal_end; - } - return 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); - - av_freep(buf); - *size = avio_close_dyn_buf(pb, buf); - return 0; -} - -int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len) -{ - if (len > 6) { - /* check for h264 start code */ - if (AV_RB32(data) == 0x00000001 || - AV_RB24(data) == 0x000001) { - uint8_t *buf=NULL, *end, *start; - uint32_t sps_size=0, pps_size=0; - uint8_t *sps=0, *pps=0; - - int ret = ff_avc_parse_nal_units_buf(data, &buf, &len); - if (ret < 0) - return ret; - start = buf; - end = buf + len; - - /* 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 */ - sps = buf; - sps_size = size; - } else if (nal_type == 8) { /* PPS */ - pps = buf; - pps_size = size; - } - - buf += size; - } - - if (!sps || !pps || sps_size < 4 || sps_size > UINT16_MAX || pps_size > UINT16_MAX) - return AVERROR_INVALIDDATA; - - avio_w8(pb, 1); /* version */ - avio_w8(pb, sps[1]); /* profile */ - avio_w8(pb, sps[2]); /* profile compat */ - avio_w8(pb, sps[3]); /* level */ - avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */ - avio_w8(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */ - - avio_wb16(pb, sps_size); - avio_write(pb, sps, sps_size); - avio_w8(pb, 1); /* number of pps */ - avio_wb16(pb, pps_size); - avio_write(pb, pps, pps_size); - av_free(start); - } else { - avio_write(pb, data, len); - } - } - return 0; -} - -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); - 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; -} |