Initial revision

Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 306 insertions, 0 deletions

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
new file mode 100644
index 0000000000..9497f90117
--- /dev/null
+++ b/libavcodec/utils.c
@@ -0,0 +1,306 @@
+/*
+ * utils for libavcodec
+ * Copyright (c) 2001 Gerard Lantau.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include "common.h"
+#include "dsputil.h"
+#include "avcodec.h"
+
+/* memory alloc */
+void *av_mallocz(int size)
+{
+    void *ptr;
+    ptr = malloc(size);
+    if (!ptr)
+        return NULL;
+    memset(ptr, 0, size);
+    return ptr;
+}
+
+/* encoder management */
+AVCodec *first_avcodec;
+
+void register_avcodec(AVCodec *format)
+{
+    AVCodec **p;
+    p = &first_avcodec;
+    while (*p != NULL) p = &(*p)->next;
+    *p = format;
+    format->next = NULL;
+}
+
+int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
+{
+    int ret;
+
+    avctx->codec = codec;
+    avctx->frame_number = 0;
+    avctx->priv_data = av_mallocz(codec->priv_data_size);
+    if (!avctx->priv_data) 
+        return -ENOMEM;
+    ret = avctx->codec->init(avctx);
+    if (ret < 0) {
+        free(avctx->priv_data);
+        avctx->priv_data = NULL;
+        return ret;
+    }
+    return 0;
+}
+
+int avcodec_encode_audio(AVCodecContext *avctx, UINT8 *buf, int buf_size, 
+                         const short *samples)
+{
+    int ret;
+
+    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
+    avctx->frame_number++;
+    return ret;
+}
+
+int avcodec_encode_video(AVCodecContext *avctx, UINT8 *buf, int buf_size, 
+                         const AVPicture *pict)
+{
+    int ret;
+
+    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
+    avctx->frame_number++;
+    return ret;
+}
+
+/* decode a frame. return -1 if error, otherwise return the number of
+   bytes used. If no frame could be decompressed, *got_picture_ptr is
+   zero. Otherwise, it is non zero */
+int avcodec_decode_video(AVCodecContext *avctx, AVPicture *picture, 
+                         int *got_picture_ptr,
+                         UINT8 *buf, int buf_size)
+{
+    int ret;
+
+    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
+                               buf, buf_size);
+    avctx->frame_number++;
+    return ret;
+}
+
+/* decode an audio frame. return -1 if error, otherwise return the
+   *number of bytes used. If no frame could be decompressed,
+   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
+   *size in BYTES. */
+int avcodec_decode_audio(AVCodecContext *avctx, INT16 *samples, 
+                         int *frame_size_ptr,
+                         UINT8 *buf, int buf_size)
+{
+    int ret;
+
+    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
+                               buf, buf_size);
+    avctx->frame_number++;
+    return ret;
+}
+
+int avcodec_close(AVCodecContext *avctx)
+{
+    if (avctx->codec->close)
+        avctx->codec->close(avctx);
+    free(avctx->priv_data);
+    avctx->priv_data = NULL;
+    avctx->codec = NULL;
+    return 0;
+}
+
+AVCodec *avcodec_find_encoder(enum CodecID id)
+{
+    AVCodec *p;
+    p = first_avcodec;
+    while (p) {
+        if (p->encode != NULL && p->id == id)
+            return p;
+        p = p->next;
+    }
+    return NULL;
+}
+
+AVCodec *avcodec_find_decoder(enum CodecID id)
+{
+    AVCodec *p;
+    p = first_avcodec;
+    while (p) {
+        if (p->decode != NULL && p->id == id)
+            return p;
+        p = p->next;
+    }
+    return NULL;
+}
+
+AVCodec *avcodec_find_decoder_by_name(const char *name)
+{
+    AVCodec *p;
+    p = first_avcodec;
+    while (p) {
+        if (p->decode != NULL && strcmp(name,p->name) == 0)
+            return p;
+        p = p->next;
+    }
+    return NULL;
+}
+
+AVCodec *avcodec_find(enum CodecID id)
+{
+    AVCodec *p;
+    p = first_avcodec;
+    while (p) {
+        if (p->id == id)
+            return p;
+        p = p->next;
+    }
+    return NULL;
+}
+
+void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
+{
+    const char *codec_name;
+    AVCodec *p;
+    char buf1[32];
+
+    if (encode)
+        p = avcodec_find_encoder(enc->codec_id);
+    else
+        p = avcodec_find_decoder(enc->codec_id);
+
+    if (p) {
+        codec_name = p->name;
+    } else if (enc->codec_name[0] != '\0') {
+        codec_name = enc->codec_name;
+    } else {
+        /* output avi tags */
+        if (enc->codec_type == CODEC_TYPE_VIDEO) {
+            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
+                     enc->codec_tag & 0xff,
+                     (enc->codec_tag >> 8) & 0xff,
+                     (enc->codec_tag >> 16) & 0xff,
+                     (enc->codec_tag >> 24) & 0xff);
+        } else {
+            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
+        }
+        codec_name = buf1;
+    }
+
+    switch(enc->codec_type) {
+    case CODEC_TYPE_VIDEO:
+        snprintf(buf, buf_size,
+                 "Video: %s%s",
+                 codec_name, enc->flags & CODEC_FLAG_HQ ? " (hq)" : "");
+        if (enc->width) {
+            snprintf(buf + strlen(buf), buf_size - strlen(buf),
+                     ", %dx%d, %0.2f fps",
+                     enc->width, enc->height, 
+                     (float)enc->frame_rate / FRAME_RATE_BASE);
+        }
+        break;
+    case CODEC_TYPE_AUDIO:
+        snprintf(buf, buf_size,
+                 "Audio: %s",
+                 codec_name);
+        if (enc->sample_rate) {
+            snprintf(buf + strlen(buf), buf_size - strlen(buf),
+                     ", %d Hz, %s",
+                     enc->sample_rate,
+                     enc->channels == 2 ? "stereo" : "mono");
+        }
+        break;
+    default:
+        abort();
+    }
+    if (enc->bit_rate != 0) {
+        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
+                 ", %d kb/s", enc->bit_rate / 1000);
+    }
+}
+
+/* must be called before any other functions */
+void avcodec_init(void)
+{
+    dsputil_init();
+}
+
+/* simple call to use all the codecs */
+void avcodec_register_all(void)
+{
+    register_avcodec(&ac3_encoder);
+    register_avcodec(&mp2_encoder);
+    register_avcodec(&mpeg1video_encoder);
+    register_avcodec(&h263_encoder);
+    register_avcodec(&h263p_encoder);
+    register_avcodec(&rv10_encoder);
+    register_avcodec(&mjpeg_encoder);
+    register_avcodec(&opendivx_encoder);
+    register_avcodec(&msmpeg4_encoder);
+    register_avcodec(&pcm_codec);
+    register_avcodec(&rawvideo_codec);
+    /* decoders */
+    register_avcodec(&h263_decoder);
+    register_avcodec(&opendivx_decoder);
+    register_avcodec(&msmpeg4_decoder);
+    register_avcodec(&mpeg_decoder);
+    register_avcodec(&h263i_decoder);
+    register_avcodec(&rv10_decoder);
+}
+
+static int encode_init(AVCodecContext *s)
+{
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, 
+                        void *data, int *data_size,
+                        UINT8 *buf, int buf_size)
+{
+    return -1;
+}
+
+static int encode_frame(AVCodecContext *avctx,
+                        unsigned char *frame, int buf_size, void *data)
+{
+    return -1;
+}
+
+/* dummy pcm codec */
+AVCodec pcm_codec = {
+    "pcm",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_PCM,
+    0,
+    encode_init,
+    encode_frame,
+    NULL,
+    decode_frame,
+};
+
+AVCodec rawvideo_codec = {
+    "rawvideo",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_RAWVIDEO,
+    0,
+    encode_init,
+    encode_frame,
+    NULL,
+    decode_frame,
+};