PeerStreamer

/*

 * PNM image format

 * Copyright (c) 2002, 2003 Fabrice Bellard

 *

 * 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

 */

#include "avcodec.h"

#include "bytestream.h"

#include "pnm.h"

static int pnm_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,

                            int buf_size, void *data)

{

    PNMContext *s     = avctx->priv_data;

    AVFrame *pict     = data;

    AVFrame * const p = (AVFrame*)&s->picture;

    int i, h, h1, c, n, linesize;

    uint8_t *ptr, *ptr1, *ptr2;

    if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {

        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");

        return -1;

    }

    *p           = *pict;

    p->pict_type = FF_I_TYPE;

    p->key_frame = 1;

    s->bytestream_start =

    s->bytestream       = outbuf;

    s->bytestream_end   = outbuf + buf_size;

    h  = avctx->height;

    h1 = h;

    switch (avctx->pix_fmt) {

    case PIX_FMT_MONOWHITE:

        c  = '4';

        n  = (avctx->width + 7) >> 3;

        break;

    case PIX_FMT_GRAY8:

        c  = '5';

        n  = avctx->width;

        break;

    case PIX_FMT_GRAY16BE:

        c  = '5';

        n  = avctx->width * 2;

        break;

    case PIX_FMT_RGB24:

        c  = '6';

        n  = avctx->width * 3;

        break;

    case PIX_FMT_RGB48BE:

        c  = '6';

        n  = avctx->width * 6;

        break;

    case PIX_FMT_YUV420P:

        c  = '5';

        n  = avctx->width;

        h1 = (h * 3) / 2;

        break;

    default:

        return -1;

    }

    snprintf(s->bytestream, s->bytestream_end - s->bytestream,

             "P%c\n%d %d\n", c, avctx->width, h1);

    s->bytestream += strlen(s->bytestream);

    if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {

        snprintf(s->bytestream, s->bytestream_end - s->bytestream,

                 "%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE && avctx->pix_fmt != PIX_FMT_RGB48BE) ? 255 : 65535);

        s->bytestream += strlen(s->bytestream);

    }

    ptr      = p->data[0];

    linesize = p->linesize[0];

    for (i = 0; i < h; i++) {

        memcpy(s->bytestream, ptr, n);

        s->bytestream += n;

        ptr           += linesize;

    }

    if (avctx->pix_fmt == PIX_FMT_YUV420P) {

        h >>= 1;

        n >>= 1;

        ptr1 = p->data[1];

        ptr2 = p->data[2];

        for (i = 0; i < h; i++) {

            memcpy(s->bytestream, ptr1, n);

            s->bytestream += n;

            memcpy(s->bytestream, ptr2, n);

            s->bytestream += n;

                ptr1 += p->linesize[1];

                ptr2 += p->linesize[2];

        }

    }

    return s->bytestream - s->bytestream_start;

}

#if CONFIG_PGM_ENCODER

AVCodec ff_pgm_encoder = {

    "pgm",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_PGM,

    sizeof(PNMContext),

    ff_pnm_init,

    pnm_encode_frame,

    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},

    .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),

};

#endif

#if CONFIG_PGMYUV_ENCODER

AVCodec ff_pgmyuv_encoder = {

    "pgmyuv",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_PGMYUV,

    sizeof(PNMContext),

    ff_pnm_init,

    pnm_encode_frame,

    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},

    .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),

};

#endif

#if CONFIG_PPM_ENCODER

AVCodec ff_ppm_encoder = {

    "ppm",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_PPM,

    sizeof(PNMContext),

    ff_pnm_init,

    pnm_encode_frame,

    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},

    .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),

};

#endif

#if CONFIG_PBM_ENCODER

AVCodec ff_pbm_encoder = {

    "pbm",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_PBM,

    sizeof(PNMContext),

    ff_pnm_init,

    pnm_encode_frame,

    .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},

    .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),

};

#endif