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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * H.264 MP4 to Annex B byte stream format filter |
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| 3 | * Copyright (c) 2007 Benoit Fouet |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include |
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| 23 | |||
| 24 | #include "libavutil/intreadwrite.h" |
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| 25 | #include "libavutil/mem.h" |
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| 26 | #include "avcodec.h" |
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| 27 | |||
| 28 | typedef struct H264BSFContext { |
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| 29 | uint8_t length_size; |
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| 30 | uint8_t first_idr; |
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| 31 | int extradata_parsed; |
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| 32 | } H264BSFContext; |
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| 33 | |||
| 34 | static int alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size, |
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| 35 | const uint8_t *sps_pps, uint32_t sps_pps_size, |
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| 36 | const uint8_t *in, uint32_t in_size) |
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| 37 | { |
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| 38 | uint32_t offset = *poutbuf_size; |
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| 39 | uint8_t nal_header_size = offset ? 3 : 4; |
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| 40 | void *tmp; |
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| 41 | |||
| 42 | *poutbuf_size += sps_pps_size + in_size + nal_header_size; |
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| 43 | tmp = av_realloc(*poutbuf, *poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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| 44 | if (!tmp) |
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| 45 | return AVERROR(ENOMEM); |
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| 46 | *poutbuf = tmp; |
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| 47 | if (sps_pps) |
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| 48 | memcpy(*poutbuf + offset, sps_pps, sps_pps_size); |
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| 49 | memcpy(*poutbuf + sps_pps_size + nal_header_size + offset, in, in_size); |
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| 50 | if (!offset) { |
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| 51 | AV_WB32(*poutbuf + sps_pps_size, 1); |
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| 52 | } else { |
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| 53 | (*poutbuf + offset + sps_pps_size)[0] = |
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| 54 | (*poutbuf + offset + sps_pps_size)[1] = 0; |
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| 55 | (*poutbuf + offset + sps_pps_size)[2] = 1; |
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| 56 | } |
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| 57 | |||
| 58 | return 0; |
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| 59 | } |
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| 60 | |||
| 61 | static int h264_extradata_to_annexb(AVCodecContext *avctx, const int padding) |
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| 62 | { |
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| 63 | uint16_t unit_size; |
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| 64 | uint64_t total_size = 0; |
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| 65 | uint8_t *out = NULL, unit_nb, sps_done = 0, |
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| 66 | sps_seen = 0, pps_seen = 0; |
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| 67 | const uint8_t *extradata = avctx->extradata + 4; |
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| 68 | static const uint8_t nalu_header[4] = { 0, 0, 0, 1 }; |
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| 69 | int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size |
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| 70 | |||
| 71 | /* retrieve sps and pps unit(s) */ |
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| 72 | unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */ |
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| 73 | if (!unit_nb) { |
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| 74 | goto pps; |
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| 75 | } else { |
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| 76 | sps_seen = 1; |
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| 77 | } |
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| 78 | |||
| 79 | while (unit_nb--) { |
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| 80 | void *tmp; |
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| 81 | |||
| 82 | unit_size = AV_RB16(extradata); |
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| 83 | total_size += unit_size + 4; |
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| 84 | if (total_size > INT_MAX - padding) { |
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| 85 | av_log(avctx, AV_LOG_ERROR, |
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| 86 | "Too big extradata size, corrupted stream or invalid MP4/AVCC bitstream\n"); |
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| 87 | av_free(out); |
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| 88 | return AVERROR(EINVAL); |
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| 89 | } |
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| 90 | if (extradata + 2 + unit_size > avctx->extradata + avctx->extradata_size) { |
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| 91 | av_log(avctx, AV_LOG_ERROR, "Packet header is not contained in global extradata, " |
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| 92 | "corrupted stream or invalid MP4/AVCC bitstream\n"); |
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| 93 | av_free(out); |
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| 94 | return AVERROR(EINVAL); |
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| 95 | } |
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| 96 | tmp = av_realloc(out, total_size + padding); |
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| 97 | if (!tmp) { |
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| 98 | av_free(out); |
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| 99 | return AVERROR(ENOMEM); |
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| 100 | } |
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| 101 | out = tmp; |
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| 102 | memcpy(out + total_size - unit_size - 4, nalu_header, 4); |
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| 103 | memcpy(out + total_size - unit_size, extradata + 2, unit_size); |
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| 104 | extradata += 2 + unit_size; |
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| 105 | pps: |
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| 106 | if (!unit_nb && !sps_done++) { |
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| 107 | unit_nb = *extradata++; /* number of pps unit(s) */ |
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| 108 | if (unit_nb) |
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| 109 | pps_seen = 1; |
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| 110 | } |
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| 111 | } |
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| 112 | |||
| 113 | if (out) |
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| 114 | memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
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| 115 | |||
| 116 | if (!sps_seen) |
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| 117 | av_log(avctx, AV_LOG_WARNING, |
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| 118 | "Warning: SPS NALU missing or invalid. " |
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| 119 | "The resulting stream may not play.\n"); |
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| 120 | |||
| 121 | if (!pps_seen) |
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| 122 | av_log(avctx, AV_LOG_WARNING, |
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| 123 | "Warning: PPS NALU missing or invalid. " |
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| 124 | "The resulting stream may not play.\n"); |
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| 125 | |||
| 126 | av_free(avctx->extradata); |
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| 127 | avctx->extradata = out; |
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| 128 | avctx->extradata_size = total_size; |
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| 129 | |||
| 130 | return length_size; |
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| 131 | } |
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| 132 | |||
| 133 | static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc, |
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| 134 | AVCodecContext *avctx, const char *args, |
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| 135 | uint8_t **poutbuf, int *poutbuf_size, |
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| 136 | const uint8_t *buf, int buf_size, |
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| 137 | int keyframe) |
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| 138 | { |
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| 139 | H264BSFContext *ctx = bsfc->priv_data; |
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| 140 | int i; |
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| 141 | uint8_t unit_type; |
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| 142 | int32_t nal_size; |
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| 143 | uint32_t cumul_size = 0; |
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| 144 | const uint8_t *buf_end = buf + buf_size; |
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| 145 | int ret = 0; |
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| 146 | |||
| 147 | /* nothing to filter */ |
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| 148 | if (!avctx->extradata || avctx->extradata_size < 6) { |
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| 149 | *poutbuf = (uint8_t *)buf; |
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| 150 | *poutbuf_size = buf_size; |
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| 151 | return 0; |
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| 152 | } |
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| 153 | |||
| 154 | /* retrieve sps and pps NAL units from extradata */ |
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| 155 | if (!ctx->extradata_parsed) { |
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| 156 | ret = h264_extradata_to_annexb(avctx, FF_INPUT_BUFFER_PADDING_SIZE); |
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| 157 | if (ret < 0) |
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| 158 | return ret; |
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| 159 | ctx->length_size = ret; |
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| 160 | ctx->first_idr = 1; |
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| 161 | ctx->extradata_parsed = 1; |
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| 162 | } |
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| 163 | |||
| 164 | *poutbuf_size = 0; |
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| 165 | *poutbuf = NULL; |
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| 166 | do { |
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| 167 | ret= AVERROR(EINVAL); |
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| 168 | if (buf + ctx->length_size > buf_end) |
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| 169 | goto fail; |
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| 170 | |||
| 171 | for (nal_size = 0, i = 0; i |
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| 172 | nal_size = (nal_size << 8) | buf[i]; |
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| 173 | |||
| 174 | buf += ctx->length_size; |
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| 175 | unit_type = *buf & 0x1f; |
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| 176 | |||
| 177 | if (buf + nal_size > buf_end || nal_size < 0) |
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| 178 | goto fail; |
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| 179 | |||
| 180 | /* prepend only to the first type 5 NAL unit of an IDR picture */ |
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| 181 | if (ctx->first_idr && unit_type == 5) { |
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| 182 | if ((ret=alloc_and_copy(poutbuf, poutbuf_size, |
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| 183 | avctx->extradata, avctx->extradata_size, |
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| 184 | buf, nal_size)) < 0) |
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| 185 | goto fail; |
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| 186 | ctx->first_idr = 0; |
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| 187 | } else { |
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| 188 | if ((ret=alloc_and_copy(poutbuf, poutbuf_size, |
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| 189 | NULL, 0, buf, nal_size)) < 0) |
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| 190 | goto fail; |
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| 191 | if (!ctx->first_idr && unit_type == 1) |
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| 192 | ctx->first_idr = 1; |
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| 193 | } |
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| 194 | |||
| 195 | buf += nal_size; |
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| 196 | cumul_size += nal_size + ctx->length_size; |
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| 197 | } while (cumul_size < buf_size); |
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| 198 | |||
| 199 | return 1; |
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| 200 | |||
| 201 | fail: |
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| 202 | av_freep(poutbuf); |
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| 203 | *poutbuf_size = 0; |
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| 204 | return ret; |
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| 205 | } |
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| 206 | |||
| 207 | AVBitStreamFilter ff_h264_mp4toannexb_bsf = { |
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| 208 | .name = "h264_mp4toannexb", |
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| 209 | .priv_data_size = sizeof(H264BSFContext), |
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| 210 | .filter = h264_mp4toannexb_filter, |
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| 211 | }; |