| /* | |
| * QPEG codec | |
| * Copyright (c) 2004 Konstantin Shishkov | |
| * | |
| * 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 | |
| */ | |
| /** | |
| * @file | |
| * QPEG codec. | |
| */ | |
| #include "avcodec.h" | |
| #include "bytestream.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| typedef struct QpegContext{ | |
| AVCodecContext *avctx; | |
| AVFrame *ref; | |
| uint32_t pal[256]; | |
| GetByteContext buffer; | |
| } QpegContext; | |
| static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst, | |
| int stride, int width, int height) | |
| { | |
| int i; | |
| int code; | |
| int c0, c1; | |
| int run, copy; | |
| int filled = 0; | |
| int rows_to_go; | |
| rows_to_go = height; | |
| height--; | |
| dst = dst + height * stride; | |
| while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (rows_to_go > 0)) { | |
| code = bytestream2_get_byte(&qctx->buffer); | |
| run = copy = 0; | |
| if(code == 0xFC) /* end-of-picture code */ | |
| break; | |
| if(code >= 0xF8) { /* very long run */ | |
| c0 = bytestream2_get_byte(&qctx->buffer); | |
| c1 = bytestream2_get_byte(&qctx->buffer); | |
| run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2; | |
| } else if (code >= 0xF0) { /* long run */ | |
| c0 = bytestream2_get_byte(&qctx->buffer); | |
| run = ((code & 0xF) << 8) + c0 + 2; | |
| } else if (code >= 0xE0) { /* short run */ | |
| run = (code & 0x1F) + 2; | |
| } else if (code >= 0xC0) { /* very long copy */ | |
| c0 = bytestream2_get_byte(&qctx->buffer); | |
| c1 = bytestream2_get_byte(&qctx->buffer); | |
| copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1; | |
| } else if (code >= 0x80) { /* long copy */ | |
| c0 = bytestream2_get_byte(&qctx->buffer); | |
| copy = ((code & 0x7F) << 8) + c0 + 1; | |
| } else { /* short copy */ | |
| copy = code + 1; | |
| } | |
| /* perform actual run or copy */ | |
| if(run) { | |
| int p; | |
| p = bytestream2_get_byte(&qctx->buffer); | |
| for(i = 0; i < run; i++) { | |
| int step = FFMIN(run - i, width - filled); | |
| memset(dst+filled, p, step); | |
| filled += step; | |
| i += step - 1; | |
| if (filled >= width) { | |
| filled = 0; | |
| dst -= stride; | |
| rows_to_go--; | |
| while (run - i > width && rows_to_go > 0) { | |
| memset(dst, p, width); | |
| dst -= stride; | |
| rows_to_go--; | |
| i += width; | |
| } | |
| if(rows_to_go <= 0) | |
| break; | |
| } | |
| } | |
| } else { | |
| if (bytestream2_get_bytes_left(&qctx->buffer) < copy) | |
| copy = bytestream2_get_bytes_left(&qctx->buffer); | |
| while (copy > 0) { | |
| int step = FFMIN(copy, width - filled); | |
| bytestream2_get_bufferu(&qctx->buffer, dst + filled, step); | |
| filled += step; | |
| copy -= step; | |
| if (filled >= width) { | |
| filled = 0; | |
| dst -= stride; | |
| rows_to_go--; | |
| if(rows_to_go <= 0) | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| static const uint8_t qpeg_table_h[16] = | |
| { 0x00, 0x20, 0x20, 0x20, 0x18, 0x10, 0x10, 0x20, 0x10, 0x08, 0x18, 0x08, 0x08, 0x18, 0x10, 0x04}; | |
| static const uint8_t qpeg_table_w[16] = | |
| { 0x00, 0x20, 0x18, 0x08, 0x18, 0x10, 0x20, 0x10, 0x08, 0x10, 0x20, 0x20, 0x08, 0x10, 0x18, 0x04}; | |
| /* Decodes delta frames */ | |
| static void av_noinline qpeg_decode_inter(QpegContext *qctx, uint8_t *dst, | |
| int stride, int width, int height, | |
| int delta, const uint8_t *ctable, | |
| uint8_t *refdata) | |
| { | |
| int i, j; | |
| int code; | |
| int filled = 0; | |
| int orig_height; | |
| if (refdata) { | |
| /* copy prev frame */ | |
| for (i = 0; i < height; i++) | |
| memcpy(dst + (i * stride), refdata + (i * stride), width); | |
| } else { | |
| refdata = dst; | |
| } | |
| orig_height = height; | |
| height--; | |
| dst = dst + height * stride; | |
| while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (height >= 0)) { | |
| code = bytestream2_get_byte(&qctx->buffer); | |
| if(delta) { | |
| /* motion compensation */ | |
| while(bytestream2_get_bytes_left(&qctx->buffer) > 0 && (code & 0xF0) == 0xF0) { | |
| if(delta == 1) { | |
| int me_idx; | |
| int me_w, me_h, me_x, me_y; | |
| uint8_t *me_plane; | |
| int corr, val; | |
| /* get block size by index */ | |
| me_idx = code & 0xF; | |
| me_w = qpeg_table_w[me_idx]; | |
| me_h = qpeg_table_h[me_idx]; | |
| /* extract motion vector */ | |
| corr = bytestream2_get_byte(&qctx->buffer); | |
| val = corr >> 4; | |
| if(val > 7) | |
| val -= 16; | |
| me_x = val; | |
| val = corr & 0xF; | |
| if(val > 7) | |
| val -= 16; | |
| me_y = val; | |
| /* check motion vector */ | |
| if ((me_x + filled < 0) || (me_x + me_w + filled > width) || | |
| (height - me_y - me_h < 0) || (height - me_y >= orig_height) || | |
| (filled + me_w > width) || (height - me_h < 0)) | |
| av_log(qctx->avctx, AV_LOG_ERROR, "Bogus motion vector (%i,%i), block size %ix%i at %i,%i\n", | |
| me_x, me_y, me_w, me_h, filled, height); | |
| else { | |
| /* do motion compensation */ | |
| me_plane = refdata + (filled + me_x) + (height - me_y) * stride; | |
| for(j = 0; j < me_h; j++) { | |
| for(i = 0; i < me_w; i++) | |
| dst[filled + i - (j * stride)] = me_plane[i - (j * stride)]; | |
| } | |
| } | |
| } | |
| code = bytestream2_get_byte(&qctx->buffer); | |
| } | |
| } | |
| if(code == 0xE0) /* end-of-picture code */ | |
| break; | |
| if(code > 0xE0) { /* run code: 0xE1..0xFF */ | |
| int p; | |
| code &= 0x1F; | |
| p = bytestream2_get_byte(&qctx->buffer); | |
| for(i = 0; i <= code; i++) { | |
| dst[filled++] = p; | |
| if(filled >= width) { | |
| filled = 0; | |
| dst -= stride; | |
| height--; | |
| if (height < 0) | |
| break; | |
| } | |
| } | |
| } else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */ | |
| code &= 0x1F; | |
| if(code + 1 > bytestream2_get_bytes_left(&qctx->buffer)) | |
| break; | |
| for(i = 0; i <= code; i++) { | |
| dst[filled++] = bytestream2_get_byte(&qctx->buffer); | |
| if(filled >= width) { | |
| filled = 0; | |
| dst -= stride; | |
| height--; | |
| if (height < 0) | |
| break; | |
| } | |
| } | |
| } else if(code >= 0x80) { /* skip code: 0x80..0xBF */ | |
| int skip; | |
| code &= 0x3F; | |
| /* codes 0x80 and 0x81 are actually escape codes, | |
| skip value minus constant is in the next byte */ | |
| if(!code) | |
| skip = bytestream2_get_byte(&qctx->buffer) + 64; | |
| else if(code == 1) | |
| skip = bytestream2_get_byte(&qctx->buffer) + 320; | |
| else | |
| skip = code; | |
| filled += skip; | |
| while( filled >= width) { | |
| filled -= width; | |
| dst -= stride; | |
| height--; | |
| if(height < 0) | |
| break; | |
| } | |
| } else { | |
| /* zero code treated as one-pixel skip */ | |
| if(code) { | |
| dst[filled++] = ctable[code & 0x7F]; | |
| } | |
| else | |
| filled++; | |
| if(filled >= width) { | |
| filled = 0; | |
| dst -= stride; | |
| height--; | |
| } | |
| } | |
| } | |
| } | |
| static int decode_frame(AVCodecContext *avctx, AVFrame *p, | |
| int *got_frame, AVPacket *avpkt) | |
| { | |
| uint8_t ctable[128]; | |
| QpegContext * const a = avctx->priv_data; | |
| AVFrame * const ref = a->ref; | |
| uint8_t* outdata; | |
| int delta, intra, ret; | |
| if (avpkt->size < 0x86) { | |
| av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| bytestream2_init(&a->buffer, avpkt->data, avpkt->size); | |
| if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0) | |
| return ret; | |
| outdata = p->data[0]; | |
| bytestream2_skip(&a->buffer, 4); | |
| bytestream2_get_buffer(&a->buffer, ctable, 128); | |
| bytestream2_skip(&a->buffer, 1); | |
| delta = bytestream2_get_byte(&a->buffer); | |
| intra = delta == 0x10; | |
| if (intra) { | |
| qpeg_decode_intra(a, outdata, p->linesize[0], avctx->width, avctx->height); | |
| } else { | |
| qpeg_decode_inter(a, outdata, p->linesize[0], avctx->width, avctx->height, delta, ctable, ref->data[0]); | |
| } | |
| /* make the palette available on the way out */ | |
| #if FF_API_PALETTE_HAS_CHANGED | |
| FF_DISABLE_DEPRECATION_WARNINGS | |
| p->palette_has_changed = | |
| #endif | |
| ff_copy_palette(a->pal, avpkt, avctx); | |
| #if FF_API_PALETTE_HAS_CHANGED | |
| FF_ENABLE_DEPRECATION_WARNINGS | |
| #endif | |
| memcpy(p->data[1], a->pal, AVPALETTE_SIZE); | |
| if ((ret = av_frame_replace(ref, p)) < 0) | |
| return ret; | |
| if (intra) | |
| p->flags |= AV_FRAME_FLAG_KEY; | |
| else | |
| p->flags &= ~AV_FRAME_FLAG_KEY; | |
| p->pict_type = intra ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; | |
| *got_frame = 1; | |
| return avpkt->size; | |
| } | |
| static void decode_flush(AVCodecContext *avctx){ | |
| QpegContext * const a = avctx->priv_data; | |
| int i, pal_size; | |
| const uint8_t *pal_src; | |
| av_frame_unref(a->ref); | |
| pal_size = FFMIN(1024U, avctx->extradata_size); | |
| pal_src = avctx->extradata + avctx->extradata_size - pal_size; | |
| for (i=0; i<pal_size/4; i++) | |
| a->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i); | |
| } | |
| static av_cold int decode_end(AVCodecContext *avctx) | |
| { | |
| QpegContext * const a = avctx->priv_data; | |
| av_frame_free(&a->ref); | |
| return 0; | |
| } | |
| static av_cold int decode_init(AVCodecContext *avctx){ | |
| QpegContext * const a = avctx->priv_data; | |
| a->avctx = avctx; | |
| avctx->pix_fmt= AV_PIX_FMT_PAL8; | |
| a->ref = av_frame_alloc(); | |
| if (!a->ref) | |
| return AVERROR(ENOMEM); | |
| decode_flush(avctx); | |
| return 0; | |
| } | |
| const FFCodec ff_qpeg_decoder = { | |
| .p.name = "qpeg", | |
| CODEC_LONG_NAME("Q-team QPEG"), | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_QPEG, | |
| .priv_data_size = sizeof(QpegContext), | |
| .init = decode_init, | |
| .close = decode_end, | |
| FF_CODEC_DECODE_CB(decode_frame), | |
| .flush = decode_flush, | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | |
| }; |