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authorZdenek Kabelac <kabi@informatics.muni.cz>2002-05-14 14:17:11 +0000
committerZdenek Kabelac <kabi@informatics.muni.cz>2002-05-14 14:17:11 +0000
commite8f147930b9b972cd73b15453e2f3b4bf21c4f9b (patch)
tree43445c0c5eca9915ac6b2bffa3de1e26191a5751 /libavcodec
parent13a0314fba9470c28fbcd82377c96d87b3d32df8 (diff)
downloadffmpeg-e8f147930b9b972cd73b15453e2f3b4bf21c4f9b.tar.gz
* first shot for the new avcodec API
- comments, critics, improvements on the ffmpeg list are welcomed Originally committed as revision 494 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r--libavcodec/avcodec.c150
-rw-r--r--libavcodec/avcodec.h77
2 files changed, 227 insertions, 0 deletions
diff --git a/libavcodec/avcodec.c b/libavcodec/avcodec.c
new file mode 100644
index 0000000000..e0e0496a18
--- /dev/null
+++ b/libavcodec/avcodec.c
@@ -0,0 +1,150 @@
+#include "errno.h"
+#include "avcodec.h"
+
+#ifndef MKTAG
+#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
+#endif
+
+// private structure used to hide all internal memory allocations
+// and structures used for de/encoding - end user should
+// never see any complicated structure
+typedef struct
+{
+ AVCodec* avcodec;
+ AVCodecContext avcontext;
+} private_handle_t;
+
+static AVCodec* avcodec_find_by_fcc(uint32_t fcc)
+{
+ // translation table
+ static const struct fcc_to_avcodecid {
+ enum CodecID codec;
+ uint32_t list[4]; // maybe we could map more fcc to same codec
+ } lc[] = {
+ { CODEC_ID_H263, { MKTAG('U', '2', '6', '3'), 0 } },
+ { CODEC_ID_H263I, { MKTAG('I', '2', '6', '3'), 0 } },
+ { CODEC_ID_MSMPEG4, { MKTAG('D', 'I', 'V', '3'), 0 } },
+ { CODEC_ID_MPEG4, { MKTAG('D', 'I', 'V', 'X'), MKTAG('D', 'X', '5', '0'), 0 } },
+ { CODEC_ID_MSMPEG4V2, { MKTAG('M', 'P', '4', '2'), 0 } },
+ { CODEC_ID_MJPEG, { MKTAG('M', 'J', 'P', 'G'), 0 } },
+ { CODEC_ID_MPEG1VIDEO, { MKTAG('P', 'I', 'M', '1'), 0 } },
+ { CODEC_ID_AC3, { 0x2000, 0 } },
+ { CODEC_ID_MP2, { 0x50, 0x55, 0 } },
+
+ { CODEC_ID_NONE, {0}}
+ };
+ const struct fcc_to_avcodecid* c;
+
+ for (c = lc; c->codec != CODEC_ID_NONE; c++)
+ {
+ int i = 0;
+ while (c->list[i] != 0)
+ if (c->list[i++] == fcc)
+ return avcodec_find_decoder(c->codec);
+ }
+
+ return NULL;
+}
+
+static private_handle_t* create_handle()
+{
+ private_handle_t* t = malloc(sizeof(private_handle_t));
+ if (!t)
+ return NULL;
+
+ // register and fill
+ avcodec_init();
+ avcodec_register_all();
+ return t;
+}
+
+static void destroy_handle(private_handle_t* handle)
+{
+ if (handle)
+ {
+ if (handle->avcodec)
+ {
+ avcodec_close(&handle->avcontext);
+ }
+ free(handle);
+
+ // count referencies
+ }
+}
+
+int avcodec(void* handle, avc_cmd_t cmd, void* pin, void* pout)
+{
+ AVCodecContext* ctx = handle;
+ switch (cmd)
+ {
+ case AVC_OPEN_BY_NAME:
+ {
+ // pin char* codec name
+ private_handle_t* handle = create_handle();
+ (private_handle_t**)pout = handle;
+ if (!handle)
+ return -ENOMEM;
+ if (!handle->avcodec)
+ {
+ destroy_handle(handle);
+ (private_handle_t**)pout = NULL;
+ return -1;// better error
+ }
+ return 0;
+ }
+ case AVC_OPEN_BY_CODEC_ID:
+ {
+ // pin uint32_t codec fourcc
+ private_handle_t* handle = create_handle();
+ (private_handle_t**)pout = handle;
+ if (!handle)
+ return -ENOMEM;
+
+ if (!handle->avcodec)
+ {
+ destroy_handle(handle);
+ (private_handle_t**)pout = NULL;
+ return -1;// better error
+ }
+ return 0;
+ }
+ case AVC_OPEN_BY_FOURCC:
+ {
+ // pin uint32_t codec fourcc
+ private_handle_t* handle = create_handle();
+ (private_handle_t**)pout = handle;
+ if (!handle)
+ return -ENOMEM;
+ handle->avcodec = avcodec_find_by_fcc((uint32_t) pin);
+ if (!handle->avcodec)
+ {
+ destroy_handle(handle);
+ (private_handle_t**)pout = NULL;
+ return -1;// better error
+ }
+ return 0;
+ }
+ case AVC_CLOSE:
+ // uninit part
+ // eventually close all allocated space if this was last
+ // instance
+ destroy_handle(handle);
+ break;
+
+ case AVC_FLUSH:
+ break;
+
+ case AVC_DECODE:
+ break;
+
+ case AVC_ENCODE:
+ break;
+
+ case AVC_GET_VERSION:
+ (int*) pout = 500;
+ default:
+ return -1;
+
+ }
+ return 0;
+}
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 3bd0b8a9bb..a56f9f130b 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -426,4 +426,81 @@ void avcodec_flush_buffers(AVCodecContext *avctx);
extern int quant_store[MBR+1][MBC+1]; // [Review]
#endif
+
+/**
+ * Interface for 0.5.0 version
+ *
+ * do not even think about it's usage for this moment
+ */
+
+typedef struct {
+ // compressed size used from given memory buffer
+ int size;
+ /// I/P/B frame type
+ int frame_type;
+} avc_enc_result_t;
+
+/**
+ * Commands
+ * order can't be changed - once it was defined
+ */
+typedef enum {
+ // general commands
+ AVC_OPEN_BY_NAME = 0xACA000,
+ AVC_OPEN_BY_CODEC_ID,
+ AVC_OPEN_BY_FOURCC,
+ AVC_CLOSE,
+
+ AVC_FLUSH,
+ // pin - struct { uint8_t* src, uint_t src_size }
+ // pout - struct { AVPicture* img, consumed_bytes,
+ AVC_DECODE,
+ // pin - struct { AVPicture* img, uint8_t* dest, uint_t dest_size }
+ // pout - uint_t used_from_dest_size
+ AVC_ENCODE,
+
+ // query/get video commands
+ AVC_GET_VERSION = 0xACB000,
+ AVC_GET_WIDTH,
+ AVC_GET_HEIGHT,
+ AVC_GET_DELAY,
+ AVC_GET_QUANT_TABLE,
+ // ...
+
+ // query/get audio commands
+ AVC_GET_FRAME_SIZE = 0xABC000,
+
+ // maybe define some simple structure which
+ // might be passed to the user - but they can't
+ // contain any codec specific parts and these
+ // calls are usualy necessary only few times
+
+ // set video commands
+ AVC_SET_WIDTH = 0xACD000,
+ AVC_SET_HEIGHT,
+
+ // set video encoding commands
+ AVC_SET_FRAME_RATE = 0xACD800,
+ AVC_SET_QUALITY,
+ AVC_SET_HURRY_UP,
+
+ // set audio commands
+ AVC_SET_SAMPLE_RATE = 0xACE000,
+ AVC_SET_CHANNELS,
+
+} avc_cmd_t;
+
+/**
+ * \param handle allocated private structure by libavcodec
+ * for initialization pass NULL - will be returned pout
+ * user is supposed to know nothing about its structure
+ * \param cmd type of operation to be performed
+ * \param pint input parameter
+ * \param pout output parameter
+ *
+ * \returns command status - eventually for query command it might return
+ * integer resulting value
+ */
+int avcodec(void* handle, avc_cmd_t cmd, void* pin, void* pout);
+
#endif /* AVCODEC_H */