static int targa_encode_frame(AVCodecContext *avctx,
unsigned char *outbuf,
int buf_size, void *data){
AVFrame *p = (AVFrame *)data;
int bpp, picsize, datasize = -1;
uint8_t *out;
if(avctx->width > 0xffff || avctx->height > 0xffff) {
av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
return AVERROR(EINVAL);
}
picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
if(buf_size < picsize + 45) {
av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
return AVERROR(EINVAL);
}
p->pict_type= AV_PICTURE_TYPE_I;
p->key_frame= 1;
/* zero out the header and only set applicable fields */
memset(outbuf, 0, 12);
AV_WL16(outbuf+12, avctx->width);
AV_WL16(outbuf+14, avctx->height);
/* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
outbuf[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0);
switch(avctx->pix_fmt) {
case PIX_FMT_GRAY8:
outbuf[2] = TGA_BW; /* uncompressed grayscale image */
outbuf[16] = 8; /* bpp */
break;
case PIX_FMT_RGB555LE:
outbuf[2] = TGA_RGB; /* uncompresses true-color image */
outbuf[16] = 16; /* bpp */
break;
case PIX_FMT_BGR24:
outbuf[2] = TGA_RGB; /* uncompressed true-color image */
outbuf[16] = 24; /* bpp */
break;
case PIX_FMT_BGRA:
outbuf[2] = TGA_RGB; /* uncompressed true-color image */
outbuf[16] = 32; /* bpp */
break;
default:
av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
av_get_pix_fmt_name(avctx->pix_fmt));
return AVERROR(EINVAL);
}
bpp = outbuf[16] >> 3;
out = outbuf + 18; /* skip past the header we just output */
/* try RLE compression */
if (avctx->coder_type != FF_CODER_TYPE_RAW)
datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
/* if that worked well, mark the picture as RLE compressed */
if(datasize >= 0)
outbuf[2] |= 8;
/* if RLE didn't make it smaller, go back to no compression */
else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
out += datasize;
/* The standard recommends including this section, even if we don't use
* any of the features it affords. TODO: take advantage of the pixel
* aspect ratio and encoder ID fields available? */
memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
return out + 26 - outbuf;
}
static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *p, int *got_packet)
{
int bpp, picsize, datasize = -1, ret, i;
uint8_t *out;
if(avctx->width > 0xffff || avctx->height > 0xffff) {
av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
return AVERROR(EINVAL);
}
picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
return ret;
/* zero out the header and only set applicable fields */
memset(pkt->data, 0, 12);
AV_WL16(pkt->data+12, avctx->width);
AV_WL16(pkt->data+14, avctx->height);
/* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
pkt->data[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0);
out = pkt->data + 18; /* skip past the header we write */
avctx->bits_per_coded_sample = av_get_bits_per_pixel(&av_pix_fmt_descriptors[avctx->pix_fmt]);
switch(avctx->pix_fmt) {
case PIX_FMT_PAL8:
pkt->data[1] = 1; /* palette present */
pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
pkt->data[6] = 1; /* palette contains 256 entries */
pkt->data[7] = 24; /* palette contains 24 bit entries */
pkt->data[16] = 8; /* bpp */
for (i = 0; i < 256; i++)
AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
out += 256 * 3; /* skip past the palette we just output */
break;
case PIX_FMT_GRAY8:
pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
avctx->bits_per_coded_sample = 0x28;
pkt->data[16] = 8; /* bpp */
break;
case PIX_FMT_RGB555LE:
pkt->data[2] = TGA_RGB; /* uncompresses true-color image */
avctx->bits_per_coded_sample =
pkt->data[16] = 16; /* bpp */
break;
case PIX_FMT_BGR24:
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
pkt->data[16] = 24; /* bpp */
break;
case PIX_FMT_BGRA:
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
pkt->data[16] = 32; /* bpp */
break;
default:
av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
av_get_pix_fmt_name(avctx->pix_fmt));
return AVERROR(EINVAL);
}
bpp = pkt->data[16] >> 3;
/* try RLE compression */
if (avctx->coder_type != FF_CODER_TYPE_RAW)
datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
/* if that worked well, mark the picture as RLE compressed */
if(datasize >= 0)
pkt->data[2] |= 8;
/* if RLE didn't make it smaller, go back to no compression */
else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
out += datasize;
/* The standard recommends including this section, even if we don't use
* any of the features it affords. TODO: take advantage of the pixel
* aspect ratio and encoder ID fields available? */
memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
pkt->size = out + 26 - pkt->data;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
