It seems feasible:
We start with:
static int AC3_encode_init(AVCodecContext *avctx)
And the struct AVCodecContext contain the number of channels:
typedef struct AVCodecContext {
int bit_rate;
int bit_rate_tolerance; /* amount of +- bits (>0)*/
int flags;
int sub_id; /* some codecs needs additionnal format info. It is
stored there */
int me_method; /* ME algorithm used for video coding */
/* extra data from parent application to codec, e.g. huffman table
for mjpeg */
/* the parent should allocate and free this buffer */
void *extradata;
int extradata_size;
/* video only */
int frame_rate; /* frames per sec multiplied by FRAME_RATE_BASE */
int width, height;
int aspect_ratio_info;
#define FF_ASPECT_SQUARE 1
#define FF_ASPECT_4_3_625 2
#define FF_ASPECT_4_3_525 3
#define FF_ASPECT_16_9_625 4
#define FF_ASPECT_16_9_525 5
int gop_size; /* 0 = intra only */
enum PixelFormat pix_fmt; /* pixel format, see PIX_FMT_xxx */
int repeat_pict; /* when decoding, this signal how much the picture */
/* must be delayed. */
/* extra_delay = (repeat_pict / 2) * (1/fps) */
/* if non NULL, 'draw_horiz_band' is called by the libavcodec
decoder to draw an horizontal band. It improve cache usage. Not
all codecs can do that. You must check the codec capabilities
before */
void (*draw_horiz_band)(struct AVCodecContext *s,
UINT8 **src_ptr, int linesize,
int y, int width, int height);
/* audio only */
int sample_rate; /* samples per sec */
int channels;
^
Here |
Then, I'm a little bit lost, but I will figure it out.
My only problem is that this library seems to be dedicated to
video encoding. What if we try to use it for only sound/music
encoding ???
Regards
--
Emmanuel
To iterate is human; to recurse, is divine.
-- Unknown
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