--- /dev/null
+/*
+ * JPEG image format
+ * Copyright (c) 2003 Fabrice Bellard.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include "avformat.h"
+
+static int jpeg_probe(AVProbeData *pd)
+{
+ if (pd->buf_size >= 64 &&
+ pd->buf[0] == 0xff && pd->buf[1] == 0xd8 && pd->buf[2] == 0xff)
+ return AVPROBE_SCORE_MAX;
+ else
+ return 0;
+}
+
+typedef struct JpegOpaque {
+ int (*alloc_cb)(void *opaque, AVImageInfo *info);
+ void *opaque;
+ int ret_code;
+} JpegOpaque;
+
+/* called by the codec to allocate the image */
+static int jpeg_get_buffer(AVCodecContext *c, AVFrame *picture)
+{
+ JpegOpaque *jctx = c->opaque;
+ AVImageInfo info1, *info = &info1;
+ int ret, i;
+
+ info->width = c->width;
+ info->height = c->height;
+ switch(c->pix_fmt) {
+ case PIX_FMT_YUV420P:
+ info->pix_fmt = PIX_FMT_YUVJ420P;
+ break;
+ case PIX_FMT_YUV422P:
+ info->pix_fmt = PIX_FMT_YUVJ422P;
+ break;
+ case PIX_FMT_YUV444P:
+ info->pix_fmt = PIX_FMT_YUVJ444P;
+ break;
+ default:
+ return -1;
+ }
+ ret = jctx->alloc_cb(jctx->opaque, info);
+ if (ret) {
+ jctx->ret_code = ret;
+ return -1;
+ } else {
+ for(i=0;i<3;i++) {
+ picture->data[i] = info->pict.data[i];
+ picture->linesize[i] = info->pict.linesize[i];
+ }
+ return 0;
+ }
+}
+
+static void img_copy(uint8_t *dst, int dst_wrap,
+ uint8_t *src, int src_wrap,
+ int width, int height)
+{
+ for(;height > 0; height--) {
+ memcpy(dst, src, width);
+ dst += dst_wrap;
+ src += src_wrap;
+ }
+}
+
+/* XXX: libavcodec is broken for truncated jpegs! */
+#define IO_BUF_SIZE (1024*1024)
+
+static int jpeg_read(ByteIOContext *f,
+ int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
+{
+ AVCodecContext *c;
+ AVFrame *picture, picture1;
+ int len, size, got_picture, i;
+ uint8_t *inbuf_ptr, inbuf[IO_BUF_SIZE];
+ JpegOpaque jctx;
+
+ jctx.alloc_cb = alloc_cb;
+ jctx.opaque = opaque;
+ jctx.ret_code = -1; /* default return code is error */
+
+ c = avcodec_alloc_context();
+ if (!c)
+ return -1;
+ picture= avcodec_alloc_frame();
+ if (!picture) {
+ av_free(c);
+ return -1;
+ }
+ c->opaque = &jctx;
+ c->get_buffer = jpeg_get_buffer;
+ c->flags |= CODEC_FLAG_TRUNCATED; /* we dont send complete frames */
+ if (avcodec_open(c, &mjpeg_decoder) < 0)
+ goto fail1;
+ for(;;) {
+ size = get_buffer(f, inbuf, sizeof(inbuf));
+ if (size == 0)
+ break;
+ inbuf_ptr = inbuf;
+ while (size > 0) {
+ len = avcodec_decode_video(c, &picture1, &got_picture,
+ inbuf_ptr, size);
+ if (len < 0)
+ goto fail;
+ if (got_picture)
+ goto the_end;
+ size -= len;
+ inbuf_ptr += len;
+ }
+ }
+ the_end:
+ /* XXX: currently, the mjpeg decoder does not use AVFrame, so we
+ must do it by hand */
+ if (jpeg_get_buffer(c, picture) < 0)
+ goto fail;
+ for(i=0;i<3;i++) {
+ int w, h;
+ w = c->width;
+ h = c->height;
+ if (i >= 1) {
+ switch(c->pix_fmt) {
+ default:
+ case PIX_FMT_YUV420P:
+ w = (w + 1) >> 1;
+ h = (h + 1) >> 1;
+ break;
+ case PIX_FMT_YUV422P:
+ w = (w + 1) >> 1;
+ break;
+ case PIX_FMT_YUV444P:
+ break;
+ }
+ }
+ img_copy(picture->data[i], picture->linesize[i],
+ picture1.data[i], picture1.linesize[i],
+ w, h);
+ }
+ jctx.ret_code = 0;
+ fail:
+ avcodec_close(c);
+ fail1:
+ av_free(picture);
+ av_free(c);
+ return jctx.ret_code;
+}
+
+#ifdef CONFIG_ENCODERS
+static int jpeg_write(ByteIOContext *pb, AVImageInfo *info)
+{
+ AVCodecContext *c;
+ uint8_t *outbuf = NULL;
+ int outbuf_size, ret, size, i;
+ AVFrame *picture;
+
+ ret = -1;
+ c = avcodec_alloc_context();
+ if (!c)
+ return -1;
+ picture = avcodec_alloc_frame();
+ if (!picture)
+ goto fail2;
+ c->width = info->width;
+ c->height = info->height;
+ /* XXX: currently move that to the codec ? */
+ switch(info->pix_fmt) {
+ case PIX_FMT_YUVJ420P:
+ c->pix_fmt = PIX_FMT_YUV420P;
+ break;
+ case PIX_FMT_YUVJ422P:
+ c->pix_fmt = PIX_FMT_YUV422P;
+ break;
+ case PIX_FMT_YUVJ444P:
+ c->pix_fmt = PIX_FMT_YUV444P;
+ break;
+ default:
+ goto fail1;
+ }
+ for(i=0;i<3;i++) {
+ picture->data[i] = info->pict.data[i];
+ picture->linesize[i] = info->pict.linesize[i];
+ }
+ /* set the quality */
+ picture->quality = 3; /* XXX: a parameter should be used */
+ c->flags |= CODEC_FLAG_QSCALE;
+
+ if (avcodec_open(c, &mjpeg_encoder) < 0)
+ goto fail1;
+
+ /* XXX: needs to sort out that size problem */
+ outbuf_size = 1000000;
+ outbuf = av_malloc(outbuf_size);
+
+ size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
+ if (size < 0)
+ goto fail;
+ put_buffer(pb, outbuf, size);
+ put_flush_packet(pb);
+ ret = 0;
+
+ fail:
+ avcodec_close(c);
+ av_free(outbuf);
+ fail1:
+ av_free(picture);
+ fail2:
+ av_free(c);
+ return ret;
+}
+#endif //CONFIG_ENCODERS
+
+AVImageFormat jpeg_image_format = {
+ "jpeg",
+ "jpg,jpeg",
+ jpeg_probe,
+ jpeg_read,
+ (1 << PIX_FMT_YUVJ420P) | (1 << PIX_FMT_YUVJ422P) | (1 << PIX_FMT_YUVJ444P),
+#ifdef CONFIG_ENCODERS
+ jpeg_write,
+#else
+ NULL,
+#endif //CONFIG_ENCODERS
+};
projects / synfig.git / blobdiff