X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fqpeg.c;h=3a2e56c0fb54b9b50087b65ef5c2641415db2c55;hb=83678dbbae64ad8c501e0c732c1117e642c25dae;hp=20f166329d9fffd80331de9f7b437502ce2dca67;hpb=1c86db80a94a00e02716831268461ee7f490f157;p=ffmpeg diff --git a/libavcodec/qpeg.c b/libavcodec/qpeg.c index 20f166329d9..3a2e56c0fb5 100644 --- a/libavcodec/qpeg.c +++ b/libavcodec/qpeg.c @@ -2,38 +2,42 @@ * QPEG codec * Copyright (c) 2004 Konstantin Shishkov * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** - * @file libavcodec/qpeg.c + * @file * QPEG codec. */ #include "avcodec.h" +#include "bytestream.h" +#include "internal.h" typedef struct QpegContext{ AVCodecContext *avctx; - AVFrame pic; + AVFrame *pic; uint8_t *refdata; + uint32_t pal[256]; + GetByteContext buffer; } QpegContext; -static void qpeg_decode_intra(const uint8_t *src, uint8_t *dst, int size, - int stride, int width, int height) +static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst, + int stride, int width, int height) { int i; int code; @@ -46,31 +50,26 @@ static void qpeg_decode_intra(const uint8_t *src, uint8_t *dst, int size, height--; dst = dst + height * stride; - while((size > 0) && (rows_to_go > 0)) { - code = *src++; - size--; + 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 = *src++; - c1 = *src++; - size -= 2; + 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 = *src++; - size--; + 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 = *src++; - c1 = *src++; - size -= 2; + 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 = *src++; - size--; + c0 = bytestream2_get_byte(&qctx->buffer); copy = ((code & 0x7F) << 8) + c0 + 1; } else { /* short copy */ copy = code + 1; @@ -80,8 +79,7 @@ static void qpeg_decode_intra(const uint8_t *src, uint8_t *dst, int size, if(run) { int p; - p = *src++; - size--; + p = bytestream2_get_byte(&qctx->buffer); for(i = 0; i < run; i++) { dst[filled++] = p; if (filled >= width) { @@ -93,9 +91,8 @@ static void qpeg_decode_intra(const uint8_t *src, uint8_t *dst, int size, } } } else { - size -= copy; for(i = 0; i < copy; i++) { - dst[filled++] = *src++; + dst[filled++] = bytestream2_get_byte(&qctx->buffer); if (filled >= width) { filled = 0; dst -= stride; @@ -114,9 +111,10 @@ 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 qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, - int stride, int width, int height, - int delta, const uint8_t *ctable, uint8_t *refdata) +static void 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; @@ -131,9 +129,8 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, height--; dst = dst + height * stride; - while((size > 0) && (height >= 0)) { - code = *src++; - size--; + while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (height >= 0)) { + code = bytestream2_get_byte(&qctx->buffer); if(delta) { /* motion compensation */ @@ -150,8 +147,7 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, me_h = qpeg_table_h[me_idx]; /* extract motion vector */ - corr = *src++; - size--; + corr = bytestream2_get_byte(&qctx->buffer); val = corr >> 4; if(val > 7) @@ -165,9 +161,9 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, /* 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) || + (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", + 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 */ @@ -178,8 +174,7 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, } } } - code = *src++; - size--; + code = bytestream2_get_byte(&qctx->buffer); } } @@ -189,28 +184,30 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, int p; code &= 0x1F; - p = *src++; - size--; + 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; for(i = 0; i <= code; i++) { - dst[filled++] = *src++; + dst[filled++] = bytestream2_get_byte(&qctx->buffer); if(filled >= width) { filled = 0; dst -= stride; height--; + if (height < 0) + break; } } - size -= code + 1; } else if(code >= 0x80) { /* skip code: 0x80..0xBF */ int skip; @@ -218,9 +215,9 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, /* codes 0x80 and 0x81 are actually escape codes, skip value minus constant is in the next byte */ if(!code) - skip = (*src++) + 64; + skip = bytestream2_get_byte(&qctx->buffer) + 64; else if(code == 1) - skip = (*src++) + 320; + skip = bytestream2_get_byte(&qctx->buffer) + 320; else skip = code; filled += skip; @@ -233,8 +230,9 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, } } else { /* zero code treated as one-pixel skip */ - if(code) + if(code) { dst[filled++] = ctable[code & 0x7F]; + } else filled++; if(filled >= width) { @@ -247,75 +245,87 @@ static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size, } static int decode_frame(AVCodecContext *avctx, - void *data, int *data_size, + void *data, int *got_frame, AVPacket *avpkt) { - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; + uint8_t ctable[128]; QpegContext * const a = avctx->priv_data; - AVFrame * const p= (AVFrame*)&a->pic; + AVFrame * const p = a->pic; uint8_t* outdata; - int delta; + int delta, ret; + const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); - if(p->data[0]) - avctx->release_buffer(avctx, p); + if (avpkt->size < 0x86) { + av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); + return AVERROR_INVALIDDATA; + } - p->reference= 0; - if(avctx->get_buffer(avctx, p) < 0){ - av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); - return -1; + bytestream2_init(&a->buffer, avpkt->data, avpkt->size); + if ((ret = ff_reget_buffer(avctx, p)) < 0) { + av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); + return ret; } - outdata = a->pic.data[0]; - if(buf[0x85] == 0x10) { - qpeg_decode_intra(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height); + 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 { - delta = buf[0x85]; - qpeg_decode_inter(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height, delta, buf + 4, a->refdata); + qpeg_decode_inter(a, outdata, p->linesize[0], avctx->width, avctx->height, delta, ctable, a->refdata); } /* make the palette available on the way out */ - memcpy(a->pic.data[1], a->avctx->palctrl->palette, AVPALETTE_SIZE); - if (a->avctx->palctrl->palette_changed) { - a->pic.palette_has_changed = 1; - a->avctx->palctrl->palette_changed = 0; + if (pal) { + p->palette_has_changed = 1; + memcpy(a->pal, pal, AVPALETTE_SIZE); } + memcpy(p->data[1], a->pal, AVPALETTE_SIZE); - *data_size = sizeof(AVFrame); - *(AVFrame*)data = a->pic; + if ((ret = av_frame_ref(data, p)) < 0) + return ret; - return buf_size; + *got_frame = 1; + + return avpkt->size; } -static av_cold int decode_init(AVCodecContext *avctx){ +static av_cold int decode_end(AVCodecContext *avctx) +{ QpegContext * const a = avctx->priv_data; - a->avctx = avctx; - avctx->pix_fmt= PIX_FMT_PAL8; - a->refdata = av_malloc(avctx->width * avctx->height); + av_frame_free(&a->pic); + av_free(a->refdata); return 0; } -static av_cold int decode_end(AVCodecContext *avctx){ +static av_cold int decode_init(AVCodecContext *avctx){ QpegContext * const a = avctx->priv_data; - AVFrame * const p= (AVFrame*)&a->pic; - if(p->data[0]) - avctx->release_buffer(avctx, p); + a->avctx = avctx; + avctx->pix_fmt= AV_PIX_FMT_PAL8; + a->refdata = av_malloc(avctx->width * avctx->height); + + a->pic = av_frame_alloc(); + if (!a->pic) { + decode_end(avctx); + return AVERROR(ENOMEM); + } - av_free(a->refdata); return 0; } -AVCodec qpeg_decoder = { - "qpeg", - CODEC_TYPE_VIDEO, - CODEC_ID_QPEG, - sizeof(QpegContext), - decode_init, - NULL, - decode_end, - decode_frame, - CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"), +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, + .capabilities = AV_CODEC_CAP_DR1, };