mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 09:52:17 +00:00
463 lines
12 KiB
C
463 lines
12 KiB
C
/*
|
|
* utils for libavcodec
|
|
* Copyright (c) 2001 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 "avcodec.h"
|
|
#include "dsputil.h"
|
|
#include "mpegvideo.h"
|
|
|
|
void *av_mallocz(int size)
|
|
{
|
|
void *ptr;
|
|
ptr = av_malloc(size);
|
|
if (!ptr)
|
|
return NULL;
|
|
memset(ptr, 0, size);
|
|
return ptr;
|
|
}
|
|
|
|
/* cannot call it directly because of 'void **' casting is not automatic */
|
|
void __av_freep(void **ptr)
|
|
{
|
|
av_free(*ptr);
|
|
*ptr = NULL;
|
|
}
|
|
|
|
/* 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;
|
|
if (codec->priv_data_size > 0) {
|
|
avctx->priv_data = av_mallocz(codec->priv_data_size);
|
|
if (!avctx->priv_data)
|
|
return -ENOMEM;
|
|
} else {
|
|
avctx->priv_data = NULL;
|
|
}
|
|
ret = avctx->codec->init(avctx);
|
|
if (ret < 0) {
|
|
av_freep(&avctx->priv_data);
|
|
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);
|
|
if (*got_picture_ptr)
|
|
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);
|
|
av_freep(&avctx->priv_data);
|
|
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_encoder_by_name(const char *name)
|
|
{
|
|
AVCodec *p;
|
|
p = first_avcodec;
|
|
while (p) {
|
|
if (p->encode != NULL && strcmp(name,p->name) == 0)
|
|
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;
|
|
}
|
|
|
|
const char *pix_fmt_str[] = {
|
|
"??",
|
|
"yuv420p",
|
|
"yuv422",
|
|
"rgb24",
|
|
"bgr24",
|
|
"yuv422p",
|
|
"yuv444p",
|
|
"rgba32",
|
|
"bgra32",
|
|
"yuv410p"
|
|
};
|
|
|
|
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
|
|
{
|
|
const char *codec_name;
|
|
AVCodec *p;
|
|
char buf1[32];
|
|
char channels_str[100];
|
|
int bitrate;
|
|
|
|
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->codec_id == CODEC_ID_RAWVIDEO) {
|
|
snprintf(buf + strlen(buf), buf_size - strlen(buf),
|
|
", %s",
|
|
pix_fmt_str[enc->pix_fmt]);
|
|
}
|
|
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);
|
|
}
|
|
snprintf(buf + strlen(buf), buf_size - strlen(buf),
|
|
", q=%d-%d", enc->qmin, enc->qmax);
|
|
|
|
bitrate = enc->bit_rate;
|
|
break;
|
|
case CODEC_TYPE_AUDIO:
|
|
snprintf(buf, buf_size,
|
|
"Audio: %s",
|
|
codec_name);
|
|
switch (enc->channels) {
|
|
case 1:
|
|
strcpy(channels_str, "mono");
|
|
break;
|
|
case 2:
|
|
strcpy(channels_str, "stereo");
|
|
break;
|
|
case 6:
|
|
strcpy(channels_str, "5:1");
|
|
break;
|
|
default:
|
|
sprintf(channels_str, "%d channels", enc->channels);
|
|
break;
|
|
}
|
|
if (enc->sample_rate) {
|
|
snprintf(buf + strlen(buf), buf_size - strlen(buf),
|
|
", %d Hz, %s",
|
|
enc->sample_rate,
|
|
channels_str);
|
|
}
|
|
|
|
/* for PCM codecs, compute bitrate directly */
|
|
switch(enc->codec_id) {
|
|
case CODEC_ID_PCM_S16LE:
|
|
case CODEC_ID_PCM_S16BE:
|
|
case CODEC_ID_PCM_U16LE:
|
|
case CODEC_ID_PCM_U16BE:
|
|
bitrate = enc->sample_rate * enc->channels * 16;
|
|
break;
|
|
case CODEC_ID_PCM_S8:
|
|
case CODEC_ID_PCM_U8:
|
|
case CODEC_ID_PCM_ALAW:
|
|
case CODEC_ID_PCM_MULAW:
|
|
bitrate = enc->sample_rate * enc->channels * 8;
|
|
break;
|
|
default:
|
|
bitrate = enc->bit_rate;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
av_abort();
|
|
}
|
|
if (bitrate != 0) {
|
|
snprintf(buf + strlen(buf), buf_size - strlen(buf),
|
|
", %d kb/s", bitrate / 1000);
|
|
}
|
|
}
|
|
|
|
/* Picture field are filled with 'ptr' addresses */
|
|
void avpicture_fill(AVPicture *picture, UINT8 *ptr,
|
|
int pix_fmt, int width, int height)
|
|
{
|
|
int size;
|
|
|
|
size = width * height;
|
|
switch(pix_fmt) {
|
|
case PIX_FMT_YUV420P:
|
|
picture->data[0] = ptr;
|
|
picture->data[1] = picture->data[0] + size;
|
|
picture->data[2] = picture->data[1] + size / 4;
|
|
picture->linesize[0] = width;
|
|
picture->linesize[1] = width / 2;
|
|
picture->linesize[2] = width / 2;
|
|
break;
|
|
case PIX_FMT_YUV422P:
|
|
picture->data[0] = ptr;
|
|
picture->data[1] = picture->data[0] + size;
|
|
picture->data[2] = picture->data[1] + size / 2;
|
|
picture->linesize[0] = width;
|
|
picture->linesize[1] = width / 2;
|
|
picture->linesize[2] = width / 2;
|
|
break;
|
|
case PIX_FMT_YUV444P:
|
|
picture->data[0] = ptr;
|
|
picture->data[1] = picture->data[0] + size;
|
|
picture->data[2] = picture->data[1] + size;
|
|
picture->linesize[0] = width;
|
|
picture->linesize[1] = width;
|
|
picture->linesize[2] = width;
|
|
break;
|
|
case PIX_FMT_RGB24:
|
|
case PIX_FMT_BGR24:
|
|
picture->data[0] = ptr;
|
|
picture->data[1] = NULL;
|
|
picture->data[2] = NULL;
|
|
picture->linesize[0] = width * 3;
|
|
break;
|
|
case PIX_FMT_RGBA32:
|
|
case PIX_FMT_BGRA32:
|
|
picture->data[0] = ptr;
|
|
picture->data[1] = NULL;
|
|
picture->data[2] = NULL;
|
|
picture->linesize[0] = width * 4;
|
|
break;
|
|
case PIX_FMT_YUV422:
|
|
picture->data[0] = ptr;
|
|
picture->data[1] = NULL;
|
|
picture->data[2] = NULL;
|
|
picture->linesize[0] = width * 2;
|
|
break;
|
|
default:
|
|
picture->data[0] = NULL;
|
|
picture->data[1] = NULL;
|
|
picture->data[2] = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
int avpicture_get_size(int pix_fmt, int width, int height)
|
|
{
|
|
int size;
|
|
|
|
size = width * height;
|
|
switch(pix_fmt) {
|
|
case PIX_FMT_YUV420P:
|
|
size = (size * 3) / 2;
|
|
break;
|
|
case PIX_FMT_YUV422P:
|
|
size = (size * 2);
|
|
break;
|
|
case PIX_FMT_YUV444P:
|
|
size = (size * 3);
|
|
break;
|
|
case PIX_FMT_RGB24:
|
|
case PIX_FMT_BGR24:
|
|
size = (size * 3);
|
|
break;
|
|
case PIX_FMT_RGBA32:
|
|
case PIX_FMT_BGRA32:
|
|
size = (size * 4);
|
|
break;
|
|
case PIX_FMT_YUV422:
|
|
size = (size * 2);
|
|
break;
|
|
default:
|
|
size = -1;
|
|
break;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
unsigned avcodec_version( void )
|
|
{
|
|
return LIBAVCODEC_VERSION_INT;
|
|
}
|
|
|
|
unsigned avcodec_build( void )
|
|
{
|
|
return LIBAVCODEC_BUILD;
|
|
}
|
|
|
|
/* must be called before any other functions */
|
|
void avcodec_init(void)
|
|
{
|
|
static int inited = 0;
|
|
|
|
if (inited != 0)
|
|
return;
|
|
inited = 1;
|
|
|
|
dsputil_init();
|
|
}
|
|
|
|
/* this should be called after seeking and before trying to decode the next frame */
|
|
void avcodec_flush_buffers(AVCodecContext *avctx)
|
|
{
|
|
MpegEncContext *s = avctx->priv_data;
|
|
s->num_available_buffers=0;
|
|
}
|
|
|
|
|
|
static int raw_encode_init(AVCodecContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int raw_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
UINT8 *buf, int buf_size)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static int raw_encode_frame(AVCodecContext *avctx,
|
|
unsigned char *frame, int buf_size, void *data)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
AVCodec rawvideo_codec = {
|
|
"rawvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_RAWVIDEO,
|
|
0,
|
|
raw_encode_init,
|
|
raw_encode_frame,
|
|
NULL,
|
|
raw_decode_frame,
|
|
};
|