mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 20394 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Diego Biurrun
16 years ago
parent
761f2c9048
commit
318888f808
3 changed files with 239 additions and 213 deletions
@ -0,0 +1,234 @@ |
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/*
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* PNM image format |
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* Copyright (c) 2002, 2003 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "pnm.h" |
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static int pnm_decode_frame(AVCodecContext *avctx, void *data, |
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int *data_size, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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PNMContext * const s = avctx->priv_data; |
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AVFrame *picture = data; |
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AVFrame * const p = (AVFrame*)&s->picture; |
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int i, n, linesize, h, upgrade = 0; |
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unsigned char *ptr; |
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s->bytestream_start = |
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s->bytestream = buf; |
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s->bytestream_end = buf + buf_size; |
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if (ff_pnm_decode_header(avctx, s) < 0) |
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return -1; |
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if (p->data[0]) |
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avctx->release_buffer(avctx, p); |
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p->reference = 0; |
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if (avctx->get_buffer(avctx, p) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return -1; |
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} |
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p->pict_type = FF_I_TYPE; |
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p->key_frame = 1; |
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switch (avctx->pix_fmt) { |
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default: |
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return -1; |
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case PIX_FMT_RGB48BE: |
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n = avctx->width * 6; |
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goto do_read; |
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case PIX_FMT_RGB24: |
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n = avctx->width * 3; |
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goto do_read; |
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case PIX_FMT_GRAY8: |
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n = avctx->width; |
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if (s->maxval < 255) |
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upgrade = 1; |
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goto do_read; |
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case PIX_FMT_GRAY16BE: |
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case PIX_FMT_GRAY16LE: |
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n = avctx->width * 2; |
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if (s->maxval < 65535) |
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upgrade = 2; |
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goto do_read; |
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case PIX_FMT_MONOWHITE: |
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case PIX_FMT_MONOBLACK: |
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n = (avctx->width + 7) >> 3; |
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do_read: |
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ptr = p->data[0]; |
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linesize = p->linesize[0]; |
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if (s->bytestream + n * avctx->height > s->bytestream_end) |
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return -1; |
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for (i = 0; i < avctx->height; i++) { |
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if (!upgrade) |
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memcpy(ptr, s->bytestream, n); |
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else if (upgrade == 1) { |
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unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval; |
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for (j = 0; j < n; j++) |
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ptr[j] = (s->bytestream[j] * f + 64) >> 7; |
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} else if (upgrade == 2) { |
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unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval; |
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for (j = 0; j < n / 2; j++) { |
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v = be2me_16(((uint16_t *)s->bytestream)[j]); |
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((uint16_t *)ptr)[j] = (v * f + 16384) >> 15; |
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} |
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} |
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s->bytestream += n; |
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ptr += linesize; |
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} |
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break; |
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case PIX_FMT_YUV420P: |
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{ |
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unsigned char *ptr1, *ptr2; |
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n = avctx->width; |
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ptr = p->data[0]; |
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linesize = p->linesize[0]; |
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if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end) |
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return -1; |
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for (i = 0; i < avctx->height; i++) { |
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memcpy(ptr, s->bytestream, n); |
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s->bytestream += n; |
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ptr += linesize; |
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} |
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ptr1 = p->data[1]; |
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ptr2 = p->data[2]; |
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n >>= 1; |
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h = avctx->height >> 1; |
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for (i = 0; i < h; i++) { |
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memcpy(ptr1, s->bytestream, n); |
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s->bytestream += n; |
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memcpy(ptr2, s->bytestream, n); |
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s->bytestream += n; |
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ptr1 += p->linesize[1]; |
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ptr2 += p->linesize[2]; |
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} |
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} |
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break; |
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case PIX_FMT_RGB32: |
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ptr = p->data[0]; |
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linesize = p->linesize[0]; |
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if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end) |
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return -1; |
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for (i = 0; i < avctx->height; i++) { |
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int j, r, g, b, a; |
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for (j = 0; j < avctx->width; j++) { |
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r = *s->bytestream++; |
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g = *s->bytestream++; |
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b = *s->bytestream++; |
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a = *s->bytestream++; |
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((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b; |
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} |
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ptr += linesize; |
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} |
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break; |
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} |
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*picture = *(AVFrame*)&s->picture; |
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*data_size = sizeof(AVPicture); |
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return s->bytestream - s->bytestream_start; |
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} |
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#if CONFIG_PGM_DECODER |
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AVCodec pgm_decoder = { |
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"pgm", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_PGM, |
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sizeof(PNMContext), |
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ff_pnm_init, |
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NULL, |
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE}, |
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.long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"), |
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}; |
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#endif |
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#if CONFIG_PGMYUV_DECODER |
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AVCodec pgmyuv_decoder = { |
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"pgmyuv", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_PGMYUV, |
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sizeof(PNMContext), |
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ff_pnm_init, |
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NULL, |
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, |
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.long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"), |
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}; |
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#endif |
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#if CONFIG_PPM_DECODER |
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AVCodec ppm_decoder = { |
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"ppm", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_PPM, |
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sizeof(PNMContext), |
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ff_pnm_init, |
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NULL, |
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE}, |
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.long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"), |
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}; |
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#endif |
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#if CONFIG_PBM_DECODER |
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AVCodec pbm_decoder = { |
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"pbm", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_PBM, |
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sizeof(PNMContext), |
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ff_pnm_init, |
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NULL, |
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE}, |
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.long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"), |
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}; |
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#endif |
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#if CONFIG_PAM_DECODER |
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AVCodec pam_decoder = { |
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"pam", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_PAM, |
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sizeof(PNMContext), |
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ff_pnm_init, |
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NULL, |
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE}, |
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.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"), |
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}; |
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#endif |
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