static int targa_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){ AVFrame *p = data; int bpp, picsize, datasize; uint8_t *out; if(avctx->width > 0xffff || avctx->height > 0xffff) { av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n"); return -1; } 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 -1; } p->pict_type= FF_I_TYPE; p->key_frame= 1; /* zero out the header and only set applicable fields */ memset(outbuf, 0, 11); AV_WL16(outbuf+12, avctx->width); AV_WL16(outbuf+14, avctx->height); outbuf[17] = 0x20; /* origin is top-left. no alpha */ /* TODO: support alpha channel */ switch(avctx->pix_fmt) { case PIX_FMT_GRAY8: outbuf[2] = 3; /* uncompressed grayscale image */ outbuf[16] = 8; /* bpp */ break; case PIX_FMT_RGB555: outbuf[2] = 2; /* uncompresses true-color image */ outbuf[16] = 16; /* bpp */ break; case PIX_FMT_BGR24: outbuf[2] = 2; /* uncompressed true-color image */ outbuf[16] = 24; /* bpp */ break; default: return -1; } bpp = outbuf[16] >> 3; out = outbuf + 18; /* skip past the header we just output */ /* try RLE compression */ 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; }