lavc doxy: add AVPacket-related stuff to a separate doxy group.

Also move AV_PKT_DATA_PARAM_CHANGE/AV_PKT_DATA_H263_MB_INFO to the
proper place.

libavcodec/avcodec.h

@@ -750,10 +750,48 @@ typedef struct AVPanScan{
 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
 
+/**
+ * @defgroup lavc_packet AVPacket
+ *
+ * Types and functions for working with AVPacket.
+ * @{
+ */
 enum AVPacketSideDataType {
     AV_PKT_DATA_PALETTE,
     AV_PKT_DATA_NEW_EXTRADATA,
+
+    /**
+     * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
+     * u32le param_flags
+     * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
+     *     s32le channel_count
+     * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
+     *     u64le channel_layout
+     * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
+     *     s32le sample_rate
+     * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
+     *     s32le width
+     *     s32le height
+     */
     AV_PKT_DATA_PARAM_CHANGE,
+
+    /**
+     * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
+     * structures with info about macroblocks relevant to splitting the
+     * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
+     * That is, it does not necessarily contain info about all macroblocks,
+     * as long as the distance between macroblocks in the info is smaller
+     * than the target payload size.
+     * Each MB info structure is 12 bytes, and is laid out as follows:
+     * u32le bit offset from the start of the packet
+     * u8    current quantizer at the start of the macroblock
+     * u8    GOB number
+     * u16le macroblock address within the GOB
+     * u8    horizontal MV predictor
+     * u8    vertical MV predictor
+     * u8    horizontal MV predictor for block number 3
+     * u8    vertical MV predictor for block number 3
+     */
     AV_PKT_DATA_H263_MB_INFO,
 };
 
@@ -823,44 +861,15 @@ typedef struct AVPacket {
 #define AV_PKT_FLAG_KEY     0x0001 ///< The packet contains a keyframe
 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
 
-/**
- * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
- * u32le param_flags
- * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
- *     s32le channel_count
- * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
- *     u64le channel_layout
- * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
- *     s32le sample_rate
- * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
- *     s32le width
- *     s32le height
- */
-
-/**
- * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
- * structures with info about macroblocks relevant to splitting the
- * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
- * That is, it does not necessarily contain info about all macroblocks,
- * as long as the distance between macroblocks in the info is smaller
- * than the target payload size.
- * Each MB info structure is 12 bytes, and is laid out as follows:
- * u32le bit offset from the start of the packet
- * u8    current quantizer at the start of the macroblock
- * u8    GOB number
- * u16le macroblock address within the GOB
- * u8    horizontal MV predictor
- * u8    vertical MV predictor
- * u8    horizontal MV predictor for block number 3
- * u8    vertical MV predictor for block number 3
- */
-
 enum AVSideDataParamChangeFlags {
     AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT  = 0x0001,
     AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
     AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE    = 0x0004,
     AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS     = 0x0008,
 };
+/**
+ * @}
+ */
 
 /**
  * Audio Video Frame.
@@ -3215,7 +3224,10 @@ void avsubtitle_free(AVSubtitle *sub);
  * @}
  */
 
-/* packet functions */
+/**
+ * @addtogroup lavc_packet
+ * @{
+ */
 
 /**
  * @deprecated use NULL instead
@@ -3306,6 +3318,10 @@ int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
                                  int *size);
 
+/**
+ * @}
+ */
+
 /* resample.c */
 
 struct ReSampleContext;