Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * FLV decoding. |
||
| 3 | * This file is part of FFmpeg. |
||
| 4 | * |
||
| 5 | * FFmpeg is free software; you can redistribute it and/or |
||
| 6 | * modify it under the terms of the GNU Lesser General Public |
||
| 7 | * License as published by the Free Software Foundation; either |
||
| 8 | * version 2.1 of the License, or (at your option) any later version. |
||
| 9 | * |
||
| 10 | * FFmpeg is distributed in the hope that it will be useful, |
||
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||
| 13 | * Lesser General Public License for more details. |
||
| 14 | * |
||
| 15 | * You should have received a copy of the GNU Lesser General Public |
||
| 16 | * License along with FFmpeg; if not, write to the Free Software |
||
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||
| 18 | */ |
||
| 19 | |||
| 20 | #include "mpegvideo.h" |
||
| 21 | #include "h263.h" |
||
| 22 | #include "flv.h" |
||
| 23 | #include "libavutil/imgutils.h" |
||
| 24 | |||
| 25 | void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){ |
||
| 26 | int is11 = get_bits1(gb); |
||
| 27 | *last = get_bits1(gb); |
||
| 28 | *run = get_bits(gb, 6); |
||
| 29 | if(is11){ |
||
| 30 | *level = get_sbits(gb, 11); |
||
| 31 | } else { |
||
| 32 | *level = get_sbits(gb, 7); |
||
| 33 | } |
||
| 34 | } |
||
| 35 | |||
| 36 | int ff_flv_decode_picture_header(MpegEncContext *s) |
||
| 37 | { |
||
| 38 | int format, width, height; |
||
| 39 | |||
| 40 | /* picture header */ |
||
| 41 | if (get_bits_long(&s->gb, 17) != 1) { |
||
| 42 | av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); |
||
| 43 | return AVERROR_INVALIDDATA; |
||
| 44 | } |
||
| 45 | format = get_bits(&s->gb, 5); |
||
| 46 | if (format != 0 && format != 1) { |
||
| 47 | av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n"); |
||
| 48 | return AVERROR_INVALIDDATA; |
||
| 49 | } |
||
| 50 | s->h263_flv = format+1; |
||
| 51 | s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */ |
||
| 52 | format = get_bits(&s->gb, 3); |
||
| 53 | switch (format) { |
||
| 54 | case 0: |
||
| 55 | width = get_bits(&s->gb, 8); |
||
| 56 | height = get_bits(&s->gb, 8); |
||
| 57 | break; |
||
| 58 | case 1: |
||
| 59 | width = get_bits(&s->gb, 16); |
||
| 60 | height = get_bits(&s->gb, 16); |
||
| 61 | break; |
||
| 62 | case 2: |
||
| 63 | width = 352; |
||
| 64 | height = 288; |
||
| 65 | break; |
||
| 66 | case 3: |
||
| 67 | width = 176; |
||
| 68 | height = 144; |
||
| 69 | break; |
||
| 70 | case 4: |
||
| 71 | width = 128; |
||
| 72 | height = 96; |
||
| 73 | break; |
||
| 74 | case 5: |
||
| 75 | width = 320; |
||
| 76 | height = 240; |
||
| 77 | break; |
||
| 78 | case 6: |
||
| 79 | width = 160; |
||
| 80 | height = 120; |
||
| 81 | break; |
||
| 82 | default: |
||
| 83 | width = height = 0; |
||
| 84 | break; |
||
| 85 | } |
||
| 86 | if(av_image_check_size(width, height, 0, s->avctx)) |
||
| 87 | return AVERROR(EINVAL); |
||
| 88 | s->width = width; |
||
| 89 | s->height = height; |
||
| 90 | |||
| 91 | s->pict_type = AV_PICTURE_TYPE_I + get_bits(&s->gb, 2); |
||
| 92 | s->droppable = s->pict_type > AV_PICTURE_TYPE_P; |
||
| 93 | if (s->droppable) |
||
| 94 | s->pict_type = AV_PICTURE_TYPE_P; |
||
| 95 | |||
| 96 | skip_bits1(&s->gb); /* deblocking flag */ |
||
| 97 | s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); |
||
| 98 | |||
| 99 | s->h263_plus = 0; |
||
| 100 | |||
| 101 | s->unrestricted_mv = 1; |
||
| 102 | s->h263_long_vectors = 0; |
||
| 103 | |||
| 104 | /* PEI */ |
||
| 105 | while (get_bits1(&s->gb) != 0) { |
||
| 106 | skip_bits(&s->gb, 8); |
||
| 107 | } |
||
| 108 | s->f_code = 1; |
||
| 109 | |||
| 110 | if (s->ehc_mode) |
||
| 111 | s->avctx->sample_aspect_ratio= (AVRational){1,2}; |
||
| 112 | |||
| 113 | if(s->avctx->debug & FF_DEBUG_PICT_INFO){ |
||
| 114 | av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n", |
||
| 115 | s->droppable ? 'D' : av_get_picture_type_char(s->pict_type), |
||
| 116 | s->h263_flv - 1, s->qscale, s->picture_number); |
||
| 117 | } |
||
| 118 | |||
| 119 | s->y_dc_scale_table= |
||
| 120 | s->c_dc_scale_table= ff_mpeg1_dc_scale_table; |
||
| 121 | |||
| 122 | return 0; |
||
| 123 | } |
||
| 124 | |||
| 125 | AVCodec ff_flv_decoder = { |
||
| 126 | .name = "flv", |
||
| 127 | .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"), |
||
| 128 | .type = AVMEDIA_TYPE_VIDEO, |
||
| 129 | .id = AV_CODEC_ID_FLV1, |
||
| 130 | .priv_data_size = sizeof(MpegEncContext), |
||
| 131 | .init = ff_h263_decode_init, |
||
| 132 | .close = ff_h263_decode_end, |
||
| 133 | .decode = ff_h263_decode_frame, |
||
| 134 | .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, |
||
| 135 | .max_lowres = 3, |
||
| 136 | .pix_fmts = ff_pixfmt_list_420, |
||
| 137 | }; |