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ffmpeg / libavcodec / pnmenc.c @ 72415b2a

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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_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,
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                            int buf_size, void *data)
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{
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    PNMContext *s     = avctx->priv_data;
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    AVFrame *pict     = data;
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    AVFrame * const p = (AVFrame*)&s->picture;
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    int i, h, h1, c, n, linesize;
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    uint8_t *ptr, *ptr1, *ptr2;
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    if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {
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        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
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        return -1;
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    }
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    *p           = *pict;
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    p->pict_type = FF_I_TYPE;
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    p->key_frame = 1;
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    s->bytestream_start =
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    s->bytestream       = outbuf;
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    s->bytestream_end   = outbuf + buf_size;
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    h  = avctx->height;
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    h1 = h;
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    switch (avctx->pix_fmt) {
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    case PIX_FMT_MONOWHITE:
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        c  = '4';
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        n  = (avctx->width + 7) >> 3;
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        break;
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    case PIX_FMT_GRAY8:
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        c  = '5';
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        n  = avctx->width;
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        break;
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    case PIX_FMT_GRAY16BE:
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        c  = '5';
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        n  = avctx->width * 2;
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        break;
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    case PIX_FMT_RGB24:
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        c  = '6';
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        n  = avctx->width * 3;
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        break;
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    case PIX_FMT_RGB48BE:
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        c  = '6';
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        n  = avctx->width * 6;
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        break;
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    case PIX_FMT_YUV420P:
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        c  = '5';
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        n  = avctx->width;
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        h1 = (h * 3) / 2;
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        break;
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    default:
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        return -1;
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    }
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    snprintf(s->bytestream, s->bytestream_end - s->bytestream,
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             "P%c\n%d %d\n", c, avctx->width, h1);
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    s->bytestream += strlen(s->bytestream);
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    if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
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        snprintf(s->bytestream, s->bytestream_end - s->bytestream,
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                 "%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE && avctx->pix_fmt != PIX_FMT_RGB48BE) ? 255 : 65535);
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        s->bytestream += strlen(s->bytestream);
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    }
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    ptr      = p->data[0];
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    linesize = p->linesize[0];
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    for (i = 0; i < h; i++) {
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        memcpy(s->bytestream, ptr, n);
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        s->bytestream += n;
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        ptr           += linesize;
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    }
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    if (avctx->pix_fmt == PIX_FMT_YUV420P) {
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        h >>= 1;
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        n >>= 1;
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        ptr1 = p->data[1];
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        ptr2 = p->data[2];
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        for (i = 0; i < h; i++) {
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            memcpy(s->bytestream, ptr1, n);
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            s->bytestream += n;
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            memcpy(s->bytestream, ptr2, 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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    return s->bytestream - s->bytestream_start;
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}
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#if CONFIG_PGM_ENCODER
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AVCodec pgm_encoder = {
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    "pgm",
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    AVMEDIA_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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    pnm_encode_frame,
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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_ENCODER
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AVCodec pgmyuv_encoder = {
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    "pgmyuv",
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    AVMEDIA_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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    pnm_encode_frame,
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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_ENCODER
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AVCodec ppm_encoder = {
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    "ppm",
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    AVMEDIA_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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    pnm_encode_frame,
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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_ENCODER
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AVCodec pbm_encoder = {
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    "pbm",
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    AVMEDIA_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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    pnm_encode_frame,
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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