| /* |
| * 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 "internal.h" |
| |
| typedef struct QpegContext{ |
| AVCodecContext *avctx; |
| AVFrame *pic, *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++) { |
| dst[filled++] = p; |
| if (filled >= width) { |
| filled = 0; |
| dst -= stride; |
| rows_to_go--; |
| if(rows_to_go <= 0) |
| break; |
| } |
| } |
| } else { |
| for(i = 0; i < copy; i++) { |
| dst[filled++] = bytestream2_get_byte(&qctx->buffer); |
| if (filled >= width) { |
| filled = 0; |
| dst -= stride; |
| rows_to_go--; |
| if(rows_to_go <= 0) |
| break; |
| } |
| } |
| } |
| } |
| } |
| |
| static const int qpeg_table_h[16] = |
| { 0x00, 0x20, 0x20, 0x20, 0x18, 0x10, 0x10, 0x20, 0x10, 0x08, 0x18, 0x08, 0x08, 0x18, 0x10, 0x04}; |
| static const int 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(NULL, 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, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| uint8_t ctable[128]; |
| QpegContext * const a = avctx->priv_data; |
| AVFrame * const p = a->pic; |
| AVFrame * const ref = a->ref; |
| uint8_t* outdata; |
| int delta, ret; |
| const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); |
| |
| 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); |
| |
| av_frame_unref(ref); |
| av_frame_move_ref(ref, p); |
| |
| 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); |
| if(delta == 0x10) { |
| 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 (pal) { |
| p->palette_has_changed = 1; |
| memcpy(a->pal, pal, AVPALETTE_SIZE); |
| } |
| memcpy(p->data[1], a->pal, AVPALETTE_SIZE); |
| |
| if ((ret = av_frame_ref(data, p)) < 0) |
| return ret; |
| |
| *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; |
| |
| 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->pic); |
| 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; |
| |
| decode_flush(avctx); |
| |
| a->pic = av_frame_alloc(); |
| a->ref = av_frame_alloc(); |
| if (!a->pic || !a->ref) { |
| decode_end(avctx); |
| return AVERROR(ENOMEM); |
| } |
| |
| return 0; |
| } |
| |
| AVCodec ff_qpeg_decoder = { |
| .name = "qpeg", |
| .long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_QPEG, |
| .priv_data_size = sizeof(QpegContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .flush = decode_flush, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
