8bps.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include "avcodec.h"

Go to the source code of this file.

Data Structures
struct	EightBpsContext
Functions
static int	decode_frame (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
static av_cold int	decode_init (AVCodecContext *avctx)
static av_cold int	decode_end (AVCodecContext *avctx)
Variables
static enum PixelFormat	pixfmt_rgb24 [] = {PIX_FMT_BGR24, PIX_FMT_RGB32, PIX_FMT_NONE}
AVCodec	eightbps_decoder

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Detailed Description

QT 8BPS Video Decoder by Roberto Togni For more information about the 8BPS format, visit: http://www.pcisys.net/~melanson/codecs/

Supports: PAL8 (RGB 8bpp, paletted) : BGR24 (RGB 24bpp) (can also output it as RGB32) : RGB32 (RGB 32bpp, 4th plane is probably alpha and it's ignored)

Definition in file 8bps.c.

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Function Documentation

static av_cold int decode_end

(

AVCodecContext *

avctx

)

[static]

Definition at line 211 of file 8bps.c.

References c, AVCodecContext::priv_data, and AVCodecContext::release_buffer.

{
        EightBpsContext * const c = avctx->priv_data;

        if (c->pic.data[0])
                avctx->release_buffer(avctx, &c->pic);

        return 0;
}

static int decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 60 of file 8bps.c.

References av_log(), AV_LOG_ERROR, AVPALETTE_SIZE, be2me_16, c, FF_BUFFER_HINTS_VALID, AVCodecContext::get_buffer, AVCodecContext::height, height, AVCodecContext::palctrl, AVPaletteControl::palette, AVPaletteControl::palette_changed, AVCodecContext::pix_fmt, PIX_FMT_RGB32, AVCodecContext::priv_data, and AVCodecContext::release_buffer.

{
        EightBpsContext * const c = avctx->priv_data;
        const unsigned char *encoded = buf;
        unsigned char *pixptr, *pixptr_end;
        unsigned int height = avctx->height; // Real image height
        unsigned int dlen, p, row;
        const unsigned char *lp, *dp;
        unsigned char count;
        unsigned int px_inc;
        unsigned int planes = c->planes;
        unsigned char *planemap = c->planemap;

        if(c->pic.data[0])
                avctx->release_buffer(avctx, &c->pic);

        c->pic.reference = 0;
        c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
        if(avctx->get_buffer(avctx, &c->pic) < 0){
                av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
                return -1;
        }

        /* Set data pointer after line lengths */
        dp = encoded + planes * (height << 1);

        /* Ignore alpha plane, don't know what to do with it */
        if (planes == 4)
                planes--;

        px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGB32);

        for (p = 0; p < planes; p++) {
                /* Lines length pointer for this plane */
                lp = encoded + p * (height << 1);

                /* Decode a plane */
                for(row = 0; row < height; row++) {
                        pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
                        pixptr_end = pixptr + c->pic.linesize[0];
                        dlen = be2me_16(*(const unsigned short *)(lp+row*2));
                        /* Decode a row of this plane */
                        while(dlen > 0) {
                                if(dp + 1 >= buf+buf_size) return -1;
                                if ((count = *dp++) <= 127) {
                                        count++;
                                        dlen -= count + 1;
                                        if (pixptr + count * px_inc > pixptr_end)
                                            break;
                                        if(dp + count > buf+buf_size) return -1;
                                        while(count--) {
                                                *pixptr = *dp++;
                                                pixptr += px_inc;
                                        }
                                } else {
                                        count = 257 - count;
                                        if (pixptr + count * px_inc > pixptr_end)
                                            break;
                                        while(count--) {
                                                *pixptr = *dp;
                                                pixptr += px_inc;
                                        }
                                        dp++;
                                        dlen -= 2;
                                }
                        }
                }
        }

        if (avctx->palctrl) {
                memcpy (c->pic.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
                if (avctx->palctrl->palette_changed) {
                        c->pic.palette_has_changed = 1;
                        avctx->palctrl->palette_changed = 0;
                } else
                        c->pic.palette_has_changed = 0;
        }

        *data_size = sizeof(AVFrame);
        *(AVFrame*)data = c->pic;

        /* always report that the buffer was completely consumed */
        return buf_size;
}

static av_cold int decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 151 of file 8bps.c.

References av_log(), AV_LOG_ERROR, avcodec_check_dimensions(), AVCodecContext::bits_per_sample, c, AVCodecContext::get_format, AVCodecContext::height, NULL, AVCodecContext::palctrl, AVCodecContext::pix_fmt, PIX_FMT_PAL8, PIX_FMT_RGB32, pixfmt_rgb24, AVCodecContext::priv_data, and AVCodecContext::width.

{
        EightBpsContext * const c = avctx->priv_data;

        c->avctx = avctx;

        c->pic.data[0] = NULL;

    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
        return 1;
    }

        switch (avctx->bits_per_sample) {
                case 8:
                        avctx->pix_fmt = PIX_FMT_PAL8;
                        c->planes = 1;
                        c->planemap[0] = 0; // 1st plane is palette indexes
                        if (avctx->palctrl == NULL) {
                                av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n");
                                return -1;
                        }
                        break;
                case 24:
                        avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
                        c->planes = 3;
                        c->planemap[0] = 2; // 1st plane is red
                        c->planemap[1] = 1; // 2nd plane is green
                        c->planemap[2] = 0; // 3rd plane is blue
                        break;
                case 32:
                        avctx->pix_fmt = PIX_FMT_RGB32;
                        c->planes = 4;
#ifdef WORDS_BIGENDIAN
                        c->planemap[0] = 1; // 1st plane is red
                        c->planemap[1] = 2; // 2nd plane is green
                        c->planemap[2] = 3; // 3rd plane is blue
                        c->planemap[3] = 0; // 4th plane is alpha???
#else
                        c->planemap[0] = 2; // 1st plane is red
                        c->planemap[1] = 1; // 2nd plane is green
                        c->planemap[2] = 0; // 3rd plane is blue
                        c->planemap[3] = 3; // 4th plane is alpha???
#endif
                        break;
                default:
                        av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_sample);
                        return -1;
        }

  return 0;
}

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Variable Documentation

AVCodec eightbps_decoder

Initial value:

 {
        "8bps",
        CODEC_TYPE_VIDEO,
        CODEC_ID_8BPS,
        sizeof(EightBpsContext),
        decode_init,
        NULL,
        decode_end,
        decode_frame,
        CODEC_CAP_DR1,
        .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
}

Definition at line 223 of file 8bps.c.

enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, PIX_FMT_NONE} [static]

Definition at line 40 of file 8bps.c.

Referenced by decode_init().

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